I've been playing around with the new version for a couple weeks now and some observations:
1. The new hood is way better than the old one and makes the lens more compact. In fact, when I had the previous version I usually left hood off since it made it so bulky. The new one, I leave on since it's hardly longer than without the hood.
2. Weight and size of the new lux with hood is close enough to the cron ASPH with hood that without a scale or ruler would be hard to tell just by picking it up. For a small/light walkaround package, I use a cron IV preasph since that's a noticeable difference to the lux.
3. Way less focus shift, now unnoticeable in regular pictures (ie not pics of rulers).
4. To me, the pictures have a very 3D look compared to the preasph.