I would say close up is not one of the pre-ASPH Summilux strong points. Field curvature and classic optical design for speed. One of the reasons until the last version it focused only to 1 meter. The ASPH version has floating elements to work in the closer range. So I was surprised how well the pre-ASPH did in the comparison above, and how the new Sonnar did (just thought it would be better).
One thing about the older version Summilux I like compared to the 3rd built-in hood and the ASPH (normal and LHSA) is the long focus throw, just feels better and maybe easier to get the focus right.
And don't forget the 1st version of the 50 Summilux. Its a nice lens, beautiful bokeh, can be sharp enough and has a flatter field than the 2nd version. It can be a wonderful 'art' lens.