The II is better in all respects but more so at the 70mm end. Going by the MTF chart. I don't know about the focusing at all but the stop advantage of the II cannot be denied.
Need a kidney,liver,lung??? Three for the price of a 500 ;-)
2000 740i-Annalisa and 2008 335i-Weebl. Weebl may wobble but has DTC
2012 X5d in Sparkling Bronze ( The Ultimate Cat Carrying Machine)