I have someone local offering me his 50L (2006) in trade for my 24-70L(2011). It is really tempting as I was planning to sell it and grab a Sigma 50 f1.4 and keep the 24-105 that came in kit lens. The 50L is very tempting but I think it is really pricy for the thin difference with the f1.4. Is the 50L really worth the price ?

