Thank you for that question, it made me check.

I have a few "time-varying" Wikipedia empty weights for the Su35

Su35

Feb 2015 Empty weight: 18,720 kg (41,274 lb)

Mar 2016 Empty weight: 18,400 kg (40,570 lb)

Feb 2019 Empty weight: 17,200 kg [citation needed] (37,920 lb)

It gets lighter with time (which is the opposite of what usually occurs as jets enter service and capability expands).

I used the value I already had in the spreadsheet which was the first one above. I would admit though that the present number is more likely to be correct, I just had not updated the sheet with it (and now have).

--

For the 'Su57' (T50 actually), a spreadsheet note shows that I used a guestimate (and operational jets generally get heavier, not lighter).

Su57

Feb 2015 Empty weight: 18,000 kg (39,680 lb)

However I questioned this rounded "18,000 kg" figure at the time, as it was clearly just a guess.

In the end I used this instead within the spreadsheet

Empty weight: 19,730 kg (43,500 lb)

There’s a note attached to the cell stating:

“Claimed empty weight, but unlikely to have a lower weight than an F-22A, given it's longer, wider and holds more fuel plus has an internal bay and a larger wing, so is likely to be heavier. I'm guessing about 43,500 lb.”

Current Wikipedia claimed weight is still:

Feb 2019 Empty weight: 18,000 kg (39,680 lb)

--

The main dimensions I considered were these:

(F-22A)

Length: 62 ft 1 in (18.92 m)

Wingspan: 44 ft 6 in (13.56 m)

Height: 16 ft 8 in (5.08 m)

Wing area: 840 ft² (78.04 m²)

Empty weight: 43,340 lb (19,700 kg)

Loaded weight: 64,840 lb (29,410 kg)

Max. takeoff weight: 83,500 lb (38,000 kg)

Fuel capacity: 18,000 lb (8,200 kg) internally

(Su-57)

Length: 19.8 m (65 ft)

Wingspan: 13.95 m (45 ft 10 in)

Height: 4.74 m (15 ft 7 in)

Wing area: 78.8 m² (848.1 ft²)

Empty weight: 18,000 kg (39,680 lb)

Loaded weight: 29,270 kg (64,530 lb) at full load

Max. takeoff weight: 35,000 kg (77,160 lb)

Fuel capacity: 10,300 kg (22,700 lb)

Personally I think it remarkable that so many figures there are similar, though the Su57 is generally a bit longer, a bit wider, slightly larger wing area, almost the same loaded weight, but claims significantly more fuel volume (i.e. "empty space weighs a lot"). It also has the added structural and skin weight of large separated inlet tunnels. But is still claimed to be 3,360 lb lighter than an F-22A when empty? How? So I decided a weight similar to the F-22A would be much closer to the truth than the unreasonably light empty weight being claimed (by what is clearly just a guessed at 18,000 kg), for an even larger jet.

If this were football, the Russian ‘specs’ seem to demand a lot of unwarranted ‘free kicks’ (as do their related propaganda themes).

And when I look at various online ‘specs’ regarding the 117’s thrust I see the same sorts of unwarranted exaggerations, whereas this interview above is saying the thrust increase is much less than claimed (could you imagine what the F-16 capability would be today if evolving engine tech and thrust had increased by only 13% in the past 40 years?).

I have a few "time-varying" Wikipedia empty weights for the Su35

Su35

Feb 2015 Empty weight: 18,720 kg (41,274 lb)

Mar 2016 Empty weight: 18,400 kg (40,570 lb)

Feb 2019 Empty weight: 17,200 kg [citation needed] (37,920 lb)

It gets lighter with time (which is the opposite of what usually occurs as jets enter service and capability expands).

I used the value I already had in the spreadsheet which was the first one above. I would admit though that the present number is more likely to be correct, I just had not updated the sheet with it (and now have).

--

For the 'Su57' (T50 actually), a spreadsheet note shows that I used a guestimate (and operational jets generally get heavier, not lighter).

Su57

Feb 2015 Empty weight: 18,000 kg (39,680 lb)

However I questioned this rounded "18,000 kg" figure at the time, as it was clearly just a guess.

In the end I used this instead within the spreadsheet

Empty weight: 19,730 kg (43,500 lb)

There’s a note attached to the cell stating:

“Claimed empty weight, but unlikely to have a lower weight than an F-22A, given it's longer, wider and holds more fuel plus has an internal bay and a larger wing, so is likely to be heavier. I'm guessing about 43,500 lb.”

Current Wikipedia claimed weight is still:

Feb 2019 Empty weight: 18,000 kg (39,680 lb)

--

The main dimensions I considered were these:

(F-22A)

Length: 62 ft 1 in (18.92 m)

Wingspan: 44 ft 6 in (13.56 m)

Height: 16 ft 8 in (5.08 m)

Wing area: 840 ft² (78.04 m²)

Empty weight: 43,340 lb (19,700 kg)

Loaded weight: 64,840 lb (29,410 kg)

Max. takeoff weight: 83,500 lb (38,000 kg)

Fuel capacity: 18,000 lb (8,200 kg) internally

(Su-57)

Length: 19.8 m (65 ft)

Wingspan: 13.95 m (45 ft 10 in)

Height: 4.74 m (15 ft 7 in)

Wing area: 78.8 m² (848.1 ft²)

Empty weight: 18,000 kg (39,680 lb)

Loaded weight: 29,270 kg (64,530 lb) at full load

Max. takeoff weight: 35,000 kg (77,160 lb)

Fuel capacity: 10,300 kg (22,700 lb)

Personally I think it remarkable that so many figures there are similar, though the Su57 is generally a bit longer, a bit wider, slightly larger wing area, almost the same loaded weight, but claims significantly more fuel volume (i.e. "empty space weighs a lot"). It also has the added structural and skin weight of large separated inlet tunnels. But is still claimed to be 3,360 lb lighter than an F-22A when empty? How? So I decided a weight similar to the F-22A would be much closer to the truth than the unreasonably light empty weight being claimed (by what is clearly just a guessed at 18,000 kg), for an even larger jet.

If this were football, the Russian ‘specs’ seem to demand a lot of unwarranted ‘free kicks’ (as do their related propaganda themes).

And when I look at various online ‘specs’ regarding the 117’s thrust I see the same sorts of unwarranted exaggerations, whereas this interview above is saying the thrust increase is much less than claimed (could you imagine what the F-16 capability would be today if evolving engine tech and thrust had increased by only 13% in the past 40 years?).

Accel + Alt + VLO + DAS + MDF + Radial Distance = LIFE . . . Always choose Stealth