The amusing thing about the focus shift issue is that it only happens when it's stopped down.
Unfortunately, given the razor-thin dof wide open, this is bound to happen a lot :-oThe My copy is worse at f2.8, which is quite amusing because it's not that sharp at MFD and it's certainly not a macro lens.
Ok, in Canon's defense this really doesn't matter as it isn't a macro lens, it's not supposed to be optimized for mfd.Failing that, View view isn't effected by the focus shift at f2.8...which another workaround.
Another workaround is just to skip this lens, esp for this price tag :-> ... but probably more buyers will turn up of the next Canon lens isn't f1.4 anymore but f1.8, as intended....
... if you know what you want the 50/1.2 for and how to do it, of course it's legit and a good idea, but this lens is also a prestige item: it's even available in bread-and-butter discount retailers in Germany (that's where I tested it a couple of times), and this means a lot of people are buying it because it looks cool (it does!) and *has* to be "the best" as it's f1.2.
My reasons for buying a 50mm f1.2 L was three fold. Firstly, I didn't care much for the 50mm f1.4 USM, it was cheap and plasticy, poor AF and build, very low contrast wide open and it's out of focus rendering was quite harsh. Secondly, I need the bright f1.2 aperture...faster the better and that's how I use them mostly. Thirdly, I needed the L build and reliability. If I buy a lens, I want it to last a long time. If I get 10 years out of it, it'll cost me roughly £100 / year for reliable no worry usage. If I sell it for 80% of what I bought it for....then that's even better.