Wanted to add that if you are into optical perfection, low abberation, lots of speed, non extending front. And you want to end up with something closely on par with Master primes or supreme primes.. have a look at otus, they have 28,55,85,100. but you can add a milvus 35 f1.4 and a wider milvus. These lenses have a pretty long focus throw, and zeiss sells even focus gears. if you buy the nikon version you have manual aperture, but obviously inverted focus rotation. You can simply call it a day. maybe the lack of other focal lengths, like 65, 75. and 24 etc keep me a bit from buying these. Also if you dont need f1.4 t1.6 you end up with a big chunk of glass 9 1 to 1.2 kgs for the otus lenses), wjhere as when you are more into f2.8 there other glass that can do the same thing. Again the rule of thumb is that once closing down glas it mostly end s up to become better (corner to corner sharpness, chormatic abberations, contrast, mtf) . so with a dzo at 2.8 you get a pretty good rendering. but still otus, will win, so if you want to get the best out of your 8k image go for otus, its basically a bargain, if you see how good the focus is, that it doesnt extend (you can add a good front od from duclos for clamp on mattebox)