I only own the 24-105L, having resisted buying other L series lenses (so far), but having used various other L lenses, if it isnt sharp either you're doing it wrong or it is broken. Very well made, excellent optics. My only gripe with the 24-70 (which I nearly bought) was the lack of focus scales on the barrel - I use these so much in my landscape work that I replaced my broken sigma 28-70 with their 24-70 instead of going 'L'
Having said that, when my sigma 70-200 dies (no sign of that yet though, it is another excellent bit of kit), it'll be replaced in white...
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