this is test with the 45/2.8 distagon. On the Leica S is equivilant to 35mm on 135 format.
Focus is swift and very accurate. Faster than when it was on Contax645 IMHO.
Also tested with 210m, 45-90zoom and 120/4 APO. All works fine.
On 120/4 the focus confirmation is very accurate.
Below are 2 quick test shot i took in TST after picking up my lens. I wasnt standing still and they were all quick non professional shots just for a quick trial.