Thanks so much for your reply, one typo was "work" I meant "worth" I guess you got that
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You mentioned 450D as that was my first post, I was having problems with it doing EOS Utility AF - turns out it could not do it as it was too old so I posted it on ebay sold it and moved up to a 600D for only $100 change over and ended up with 2 extra batteries! bargain, plus I can now do video and have iso 6400 from only 800 with the 450D.
Quality was maybe he wrong term, after watching reviews of the 24mm 2.8 pancake I thought for city type shots the 2.8 would give me more light in low light conditions as I move around side streets being in building shadows, shooting at slightly higher shutter speeds being hand held.
Thanks for your feedback.