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cv 50/1.5, pentax 50/1.4, sigma 50/1.4, rokkor MC PG 50/1.4, canon nFD 50/1.4, FL 55/1.2, etc. the sonnar is by far the smallest i agree, but it isn't winning any sharpness wide open contests.
it looks worse on aps-c, the CA is more noticeable and, of course it less sharp with the AA filter and higher pixel density.
Those might be sharper as I never own them. Based on MTF, Sonnar will be similar sharp as ZF P50, but in real world, it get the IMPRESSION of much sharper lens as there is no Haze, and contrast is much better than P50.
to me, other than 50 lux which leap forward, all f1.4sh lens have similar performance one or the other. Fast glass I have owned or owning are Nikkor AIS 50f1.2, AIS85f1.4, AIS35f1.4, P50, P85, D351.4, and VC501.1, VC351.2.
P50 and AIS35f1.4 seems lag in the group in terms of wide open, rest of them are all about same based on real world use if I am not Pixel Peeping. Though each render differently. I feel Sonnar is a POP lens wide open compare to rest of the group. That is the impression I want to pass on.
The difficult of this judgement is Sonnar is for M9, others are for D700, so work flow and PP and Raw handling engine are different, So my judgement may not valid.
It would be nice to have someone conduct the test at the same platform with NEX. Still, there are too many variables like lens sample variation, adapter, handling error make it impossible to perfect.