My Sigma 85mm f/1.4 is spot on (no MA needed) but my 50mm has front-focussing issues at f/1.4. I set my cameras to +20 but that was enough, I think it needs about +25. Tried another copy, same issue. I can live with it until I get a Canon 50L although these are still 2,5 times more expensive secondhand than a new Sigma. I definately prefer the Sigma over the Canon f/1.4 I had before because of the bokeh and a better focus ring.