I think Su-57 is a tad more advanced than F-22 because 360 degrees radar coverage. F-22 has front radar only. Su-57 has side radars and rear radar.
There is an inverse relationship between beamwidth and antenna size. Inverse = Opposite.
Essentially, for any given operating freq, the smaller the antenna, the larger the beamwidth, which is not always a good thing.
http://code7700.com/radar_beam_width.htm
Size matters. The larger the plate antenna on your radar the narrower the beam,...
The large beamwidth is good for volume, meaning the radar can scan larger areas of the sky, but cannot distinguish out individual targets that flies close together. Against the F-22, a large beamwidth is the worst thing to have.
The PAK is supposed to have active arrays at different locations on the jet. That is fine. But those arrays will not be anything larger than a hand's span. If those small arrays uses freqs longer than centimetric, the beamwidths will be nothing more than volume search. If they uses centimetric freqs, the F-22 and F-35 are shaped against those bands anyway.
Efficacy is not the same thing as efficiency.
- Efficiency = Can it do with the least amount of resources?
- Efficacy = Can it produce a desired or intended result?
So just because the PAK have something the F-22 does not, it goes not make the PAK 'more advanced'. It is about the efficacy of the technology that matters.