It's the only photography related GAS I have to control right now (i.e. not buying the SY 135mm). But I'm lucky because I've got an excuse to not buy the lens right now. I could buy it right now for my Canon 550D/T2i (EF mount), but I know I will switch to Sony E in the future, so I would have to buy it once more then since I want the lens native on any camera system.
I just bought the canon versions for my sony. I figured if I ever had to sell them the canons would sell easier. The adapted canon versions are the same length as the non adapted sony versions