save up... keep your 50 1.4 and buy the 35 when you can. My 50 1.8 is collecting dust now that I have a 1.4 (that I rarely use, but am thankful that I have it in my bag for when I do need it). My .02

All that said, I just did a studio shoot with the kit-lens on my 60D for it's focal length (most shots were at 22mm or so & @f10ish) off camera blessed strobes, they make those ill performing zooms sing.