My kit as it stands now is an (unfortunately outdated) Canon 20D, 24-105mm f4L and a 50mm f1.8 (mark 1). I am looking to start freelancing more and I'm in a position to spend some money on an additional lens. I've found the 24-105 is great for general use but I need a high quality lens to perform in low light conditions at exhibitions & events, indoors, weddings and for documentary orientated photography. If it could double as a useful portrait lens that would be great. My first thought was to go for an updated 50mm prime - however I have found after all the reviews and information i've read that none of them seem to swing me one way or the other to any particular 50mm lens. At first I was considering the Canon 50mm f1.4 but have since read that this lens doesn't perform well wide open. I then started thinking about the new Sigma 50mm f1.4 due to it's good reviews - except for the focusing issue. The Zeiss, being comparable in price, caught my interest but I also read a few different reviews that mention although it is an excellent lens stopped down, it doesn't perform well wide open either. I've even been toying with the idea of the Canon 50mm f1.2L - but it's so expensive! And again, the reviews I'm reading are not convincing me it's worth the considerable extra dosh. Considering most of the low-light photography I'm intending to do will be hand held, I've now started thinking about the Canon 35mm f1.4 . I've heard great things and it's a little cheaper than the 50mm. I am intending to start building my kit further from here, so I am really conscious of making the right long term decision. I know at some point I'll need to get a faster portrait lens than the 24-105 so perhaps down the track I'll look into the 85mm f1.2L . I was thinking that the 35mm f1.4L and 85mm 1.4L would be a awesome combo. However, money doesn't grow on trees and I would look in to buying a new camera body before i purchased a second lens - so whatever I chooce now will be 'it' for some time. So I've been wondering if the 50mm f1.2L was a good mid way compromise between the two lenses here? And is it worth all that extra money in terms of IQ - or should I take another look at the Sigma or Zeiss? Anyway, I feel a bit oversaturated with all the reviews I've been reading and I'm really struggling to narrow down to the right choice here. Any help or advise would be greaaaaatly appreciated.