I don't regret one second buying it…. it really is that good. I did a test against some other lenses we had lying around and while some of them were ok in the center at 2.8 Most of them were crap in the corners.
The so-called great value for money 50 1.8 looks terrible compared to the Otus… really down right terrible, and it feels equally as terrible operating. I never understood why people were so hyped over this Canon 50 1.8, but I guess that is needed when all you can afford is that.
I'll be picking up every Otus lens as they come out… as simple as that. But I fully acknowledge that some people are depending on AF to get the job done. I'm not… and if I am I'd still choose expensive L lenses over cheap non-L.
The thing is…. I shoot a lot of video. Actually video has become my main business by now. So I need something that operates well for video and even L lenses dont do that. The throw is too short and the sharpness fall off looks ugly, often the bokeh as well.
There's a reason that most major cinema releases, heck even Sundance and Cannes short films are shot on Arri Master / Ultra Primes or Cooke lenses. Because even though they are completely manual, the operate better, they are consistent in look and light transmission and that nice long throw for pulling focus.