I use the ZF lenses: 25,35,50 MP,85,100MP.
The 25/2.8 is a very interesting lens - flare resistent and dead sharp in the center from wide open, it has softer corners, but becomes particularly interesting if you shoot it close up - it can focus as close as 7cm from the front element, creating a very particular effect. Here are the examples:
The 35/2 Distagon has just one fault - it is big... But it is one of the sharpest lenses around, and with a great bokeh too. I do not use this one so often since I've strarted using the rangefinders, as the 35/2 Biogon on the ZI is just an unbeatable combination. Here is an example:
The 50/2 Makro Planar is a lens for all seasons, and a gem of the line. It is fairly big, but you get compensated by the quality and versatility. It is a lens which performs at the level of excellence from any distance and at any aperture. It is sharp from wide open, and improves a bit till f 5.6, but the sharpness is never excessively clinical. Here are a few shots:
The Planar 85/1.4 is a great lens too - it is portrait soft wide open, but gets bitingly sharp by f2.8 and has a wonderful spatial and colour rendering too. Sometimes, you can detect a little focus shift if you shoot at closer distances, so if you use apertures like f 5.6 or f8.0 it might be beneficial to focus at f2.8. Here are a some examples, the first one wide open:
Finally, we get to the Makro Planar 100/2 - this is probably the best quality SLR lens ever made, and it would be interesting to see the comparison against the Leica APO Makro 90... Zeiss has apparently borrowed from their cine lenses technology to make this one, and I am actually surprised that this lens is not more popular - probably because it lacks autofocus, what could be a more serious drawback for this FL for the DSLR users. If you can only afford one ZF lens, get this one, even if it is the most expensive...
This lens is simply stunning, and the only thing you can say, is that wide open it is a bit on the low contrast side. For the rest it has no faults: it is super sharp at any distance and through f11.0, it has no flare, no distortion, no ca, and has a superlative bokeh as well. You will not come even remotely close to see its maximum resolution, unless you use the slowest films and solid tripods. Here are some shots:
