I heard not so great things about the bulky 35L and with 4 stops IS the new 35 f/2 the 35L has little to offer (or am i wrong)
You 'hear' a lot of things on the Internet - shockingly, some of it is untrue.
The 35L is a wonderful lens, very sharp in the center, decently sharp in the FF corners, great bokeh. The only complaint that I have is that it lacks weather sealing. Personally, I love the 35L as a nighttime walkaround lens.
What the 35/1.4L offers over the 35/2 IS is that it lets in twice as much light. IS helps with camera shake (not a huge issue with a 35mm lens), but does nothing for subject motion - the faster aperture allows a higher shutter speed. People on the street move. Also, f/1.4 delivers greater OOF blur for more creativity with close subjects.
So I guess my question is as follows:
do you suppose that at 35mm the non L primes will outpreform the zoom
on one hand primes have usually better IQ however these are not L lenses and the new 24-70 f/2.8 suppose to be super-sharp.
I expect there will not be big differences, but since the 35/2 IS isn't yet available, we'll see. Regardless, the zoom is more convenient, but it's f/2.8. Those two factors, not IQ, should drive your decision.