Once you're done renting, are you going to buy it?
Funny you should ask that... I just got an email from LensRentals.com offering to sell me the lens for about 25 dollars more than what I could buy a new one for. Wonder if they get many buyers that way? Maybe I get to keep the nice padded case they use for shipping. Didn't read all the fine print before I deleted the message.
I still have the lens for a few more days, so far I like it. It makes nice bokeh if I'm close to the model, like within 3-5 feet.
A purchase decision depends on how much I think I will use it. For me, it would mostly be an indoor lens for available light glamour/boudoir shoots. $550 for a professional grade lens isn't a lot if you get a reasonable amount of use out of it.
I just posted some photos on my blog comparing the 35 with a 50 and an 85 if you want to see them. I'd post some here, but they are not appropriate for this forum.
Warning... NSFW....adults only: http://tinyurl.com/m5x7tsf