[Brightcolours]

I don't understand this verdict at all:

Canon 35/2 gets 4 stars and has a center resolution of 3512 LW/PH @ f/2.8

This Zeiss only gets 3 stars and has a center resolution of 4252 @ f/2.8 and on the border still very close to the center of the Canon


Is the worse verdict only because of vignetting? That could easily be corrected in post, or am I wrong?

You are wrong (in the judging of sharpness). PZ gives for each camera they do lens tests on an approximate max. resolution for their testing method. You can read the max. resolution on the top of the vertical scale. For the 5D mkII, Klaus gives a max. resolution figure of 3700 lw/ph. Klaus gives a max. resolution figure for the A7r of 4500 lw/ph. 

Of course the MTF software will give higher resolution from the 36mp sensor, and the lack of AA-filter. Says nothing about the lens, though.

 

While the numbers of the Sony are higher, the bar heights are the same or lower.

 

Both are very good little lenses, the Canon just edges it out a little bit in the tested criteria (as sharp or sharper, nicer vignetting characteristic, a tad smoother bokeh highlights, slightly lower CA even).