http://laurencekim.com/2011/06/06/your-lens-is-plenty-sharp-wide-open/
Saw this article posted on cameracraniums site and reckon there is a fair bit of truth in it. I cannot afford 1.4 lenses just now but have noticed the same effect when using my 50mm and 85 mm lenses sometimes at 1.8. I`ll have to do some tests but sometimes that focus point is just not in the right place and with my eyesight manual focus would be even worse!
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