I took delivery of this lens a week ago but I'm sending it back.
The lens itself when correctly exposed pulls out rendering extremely similar to the 85L ii with zero fringing in the OOF highlights - but the difference in metered exposure is massive across the other Canon 85's.
Attached is an example, Canon 5DSr on a tripod, all I did was change lenses. The ISO was set at 100, AV mode at F2, the camera did the rest with the metering mode not making any difference (Average or centre weighted).
I'm really reaching out and asking other users of this lens if I had a dud or if it's just how the lens behaves. As it is currently it's unusable if it's about 1 stop out.
These are all SOOC the portrait image was taken on a blue sky day, consistent lighting and the Tamron is on the left, the 85mm USM 1.8 on the right.