Save up for the 'Lux ASPH.
I wouldn't do that myself, but based on these two options it sounds like you're compromising. I love the sonnar, but if you want the 'Lux ASPH nothing will do until you've tried it and satisfied that curiosity. I am psychoanalyzing too much, so sorry if I'm off base there 🙂
I know the focus shift is real in the sonnar, but I have never noticed it, and I shoot wide open fairly often for portraits. That may be because I have only used the lens on the R-D1 and M8, and because of the crop I am rarely shooting at 1m.
I think the big two questions for the sonnar, as far as results are concerned, are:
1. Do you shoot wide open and around 1m?
2. Do you like the soft/creamy sonnar 'look'?
if you answered 'no' and 'yes' then go jump all over the sonnar without hesitation. I bought my LNIB sonnar for $800 and never looked back.
However, if you want the lens to have a consistent look at all apertures and like to shoot wide open around 1m, the 'Lux will suit you better. There are other reasons too (like the 'Lux has it's own distinct character), but that is a place to start.
Good luck!