I have been looking at the Sigma 85 mm art lens. I stopped at B&H and tried the lens on a Canon 5D Mark IV at the lens counter. It looks like a really sweet lens. I know it'll give really nice bokeh, better than my Tamron 70-200mm F/2.8. I am curious if I will notice a significantly sharper image. My Tamron is pretty darn sharp. I am also wondering if I would see a better low light focusing and if focus lock is faster on this lens than the Tamron. In the end I am still window shopping and debating if my desire for this lens to be added to my photo tool box is more lust than necessity. Lol. I know I will enjoy the lens and it will probably be in my bag after I sell my Canon 100-400 L. But it is always good to hear others thoughts on this lens.