After years of owning the original G1 Tamron 150-600, I tried the G2 and wasn't impressed. Switches were far too easy to move accidentally and the IQ didn't seem any better to me than the G1. So I went down a few rabbit holes, including a Nikon 200-500 (which I hated but the IQ was pretty damn good) and the expensive 500 PF (which I never learned to love but again, the IQ was fantastic).
I missed the versatility of the zoom, so I found a good clean 150-600 Sigma Contemporary from a vendor with a good return policy - expecting to be less than impressed and probably return it. NOPE!
I don't know whether I got a sharp copy or if they are all this good but wow! Wide open at 600, my lens is as sharp as my G1 Tammy at f/8 and as sharp as the 200-500 f/5.6 Nikon. I'm not going to go as far as saying it's as sharp as the 500 PF 5.6 (I'm not sure there is a sharper lens) but it's damn close.
I'm loving the light weight and easy handling. I also love that the switches are intuitive and not easy to move accidentally. This is a keeper for sure. Here are a couple images I grabbed off hand yesterday when birding with a friend.
All these images below were shot wide open. I just leave it at 6.3 now because the IQ is so good.
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