I have the Zeiss 1.4/35 and 2/35. They are _very_ different lenses.
The 1.4 has a fair bit of SA so that it looks dreamy when wide open. It also exhibits some spherochromatism which makes it a difficult lens to focus precisely (even if you use magnified live view.) The SC is very visible when it's wide open and you focus on a point source of light. It's also a heavy lens - even heavier than the 2/100 MP. So that's the downside.
Now the upside - the bokeh is wonderful...
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Rennie Park III
by
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When it's stopped down to f/2 it is _nearly_ as sharp as the 2/35, and by f/2.8 they are essentially indistinguishable but then the 1.4/35 has very little vignetting. This makes it quite versatile. It's offers a lot for my creativity.
Now, compared with the Canon 35/1.4L... the common view is that the Canon has better microcontrast near the centre. I am unconvinced of this. The MTF graphs are difficult to compare (Zeiss quotes performance at f/1.4 for 10/20/40 lp/mm and Canon at f/2.8 for 10/30 lp/mm.) Nevertheless, I tried a 35L (briefly) but it didn't excite me.
There is a detailed study off the Zeiss lenses on
Lloyd Chambers' site
.