my lux is the 46mm version (latest pre-asph) ... it is a great lens. But then again, so is the 50/cron. I don't know if the 46mm is the same optical formula as the 43mm version. Both the cron and lux have great bokeh. The contrast and resolution is slightly higher on the cron at equal apertures. Both lenses have a unique signature. Look at your photos after you've shot with the lens and decide whether you like the signature or not. Or try running a search on pbase.com with "summilux" and see if you can get some examples.
Lens signature is so highly subjective that you really need to see your own work to decide. One of my favorite lenses is the ultra cheap Nikon AFD 50mm 1.8, which costs only $99 🙂 Great out of focus signature in my opinion, but others think it has harsh bokeh. Fortunately, only my opinion counts, at least when it pertains to which lens I use ;-) cheers