Dont forget the Summarit, although this lens is more cron than CV in many respects. Guy Mancuso did some tests that showed it out resolving his Cron in almost all circumstances (near and far) and others have had the same experience regardless of MTFs published. I bought one not for that, but for its size and price (coded etc) compared to the Cron. While the lens was defective and had to be returned (focus issue), when it came back here are my thought FWIW:
Astonishingly sharp. Brutal. Not one for the ladies. Wide open it is sharper than you could ever really need, even at min focus. It gets a hair sharper at f4 and then nothing more. Contrast is medium high. Not crazy, but quite high, so bear that in mind. I do not find the min focus an issue, but I can see that some might. There is quite a difference too. With the cron you can crop down to a head, but with the rit, you get head and some neck! I dont generally photograph floating heads so it works for me.
I recently used the lens for some candids at a wedding and the shots were beautifully smooth, easily printable contrast and very sharp. Its a cracker.
The CV 75 1.8 looks lovely if you want more dreamy, soft portraits, but if you want a harder sharper lens and are considering the Cron, think real hard about the 75 Summarit. Unless you absolutely must have f2 and 0.7m focus, the Summarit seems a much better buy at half the price, lower weight, smaller filter etc