I think this is my third "Rant" thread. Let me know if I've used them all up. : )
Anyway, check this out:
Horrific. If Canon cannot make a UWA that has sharp corners at 16mm f/2.8, then what's the point of f/2.8? : )
Seriously, this is why I rarely take claims about lens performance seriously, unless pics accompany the claims. I've even seen people post pics with motion blur and/or camera shake and blame the lens.
And, of course, it does cut both ways. I've seen claims that such-and-such is "razor sharp", which sounds good, until you see the pics. So, sure, some lenses have issues, some lenses are great, but without a pics and EXIF, who knows what to make of a claim?