My benchmark is a line of 50's/60's Canon LTM39 lenses (from 19 to 135mm) which are astounding, and the FSU lenses of similar vintage are really on par with them (actually Canons are a tiny-tiny bit better, but hard to see, and their market price is 5- to 10-fold !) ; interestingly, and may-be contrary to the legend, the FSUs perform better than the Leica lenses of similar vintage in my inventory. I did not try 35 nor 90mm.
First a Jupiter 3 :

http://www.ussrphoto.com/UserContent/832018_DSCF9396_red.jpg
The post-war FED Industar 22 I tried is clearly not as sharp at infinity (may-be a manufacturing flaw preventing it from quite focusing at infinity ?) ; did not try an I-50 :

http://www.ussrphoto.com/UserContent/832018_DSCF9397_red.jpg
But the same lens does quite good at short distance :

http://www.ussrphoto.com/UserContent/832018_DSCF9256_corr_red.jpg
Back to my Auvergne landscape, if you like to see wider, here is the Orion 15 (28mm) :

http://www.ussrphoto.com/UserContent/832018_DSCF9390_red.jpg
And, last but not least, a Jupiter 11 :

http://www.ussrphoto.com/UserContent/832018_DSCF9388_red.jpg