The saga continues...
Turns out I actually bought an Elmar 50mm 2.8. I know, I was also really confused when it arrived today. I checked my email receipt and it turns out I actually bought the wrong lens from the shop, probably due to my extreme excitement... I did think it was too good to be true, the lens only cost £300.
On the plus side the lens is totally mint, I know they suffer from haze really badly and I was instantly worried when I opened it, but it's the now the cleanest lens I own! I'm going to give it a few roll before I decide weather to sell it and actually buy the summicron.
Initial impressions are really good, the lens is quite weighty and looks to have a lot of aperture blades. Now doing some reading on the Elmar, anyone had any experience of it?