I used the AIS 35/2 some years ago, which has the same (or at least very similar) optical design as the original Nikkor-O 35/2.
I found it to be very sharp. Nice colour rendition similar to other Nikkors of the same vintage. Mild barrel distortion. Never noticed flare but I rarely point lenses into the sun except at sunset. Bokeh was not so good as Ric mentioned.
I was later seduced by the AIS 35/1.4 so sold it. I sometimes also use my AI 35/2.8 (6 element version) which is a nice little lens. If you need a 35mm lens with no barrel distortion, this is the one to get.
Actually, I rarely use the 35mm focal length, I tend to shoot with 50 or 55mm as general lens, and add a 28mm or wider, skipping 35mm. However on a recent trip I decided to give my 35/1.4 a spin and quite enjoyed it.