Hi people. I've owned 4 or 5 copies of the 100-400 in the past. My relationship with them was always kind of love/hate. I found the lens absolutely invaluable for its versatility but I was never happy with the sharpness and I even had one that was so bad out of the box that I sent it back for exchange. That was till recently. I purchased one brand new last month so it is the newest copy that I have owned by at least 5-6 years. I ran all my regular tests on it and I'm stunned at the sharpness. I took a series of shots wide open @ 400mm and couldn't believe how sharp they were even zoomed in 100%. The sharpest copy that I have ever owned by a long shot.
So my question is am I just one of those lucky buyers who happens upon a super sharp 100-400 or have improvements been made in production? Are people still finding new copies that are soft?