I used to shoot weeding stills photography and used Carl Zeiss lenses on my Hassleblad 500ELX & 500CM models with 150mm sonnar 60mm Distagon and standard 80mm planar lens. I did many 20 x 24 and larger blow ups and poster size pictures and the lens really did perform. I used also a Mamiya RB 67 with revolving back and mamiya lens which I was also happy with, but it's no comparison to the Zeiss lenses. The 6 x 7 cm back was awesome. Now lets get back to choice of lenses. I am moving into cinemaphotography and am still learning but because I've got a proffessional photographers background I understand the fundamentals a lot easier. The lens choice depends on what you are filming and how critical you or your customers requirements are with respect to sharpness, colour, image quality. When making a movie I just don't think The lens quality is as important as when I shot still on my hassleblad. Videos are edited and the original capured data is most of the time manipulated at the editing stage. My advice is get a good top lens if you are doing more stills and get a good quality (but not the best) if you are shooting mainly videos. I'm going to purchase the SONY NEX FS100 with standard 18-200mm kit lens and I will treat myself to a Carl Zeiss prime lens and sony prime wide angle lens. You can go mad spending money on expensive lenses but can you justify that expense? If you can justify the expense go ahead with the purchase.