I think I have discussed elsewhere the general differnces between the Wizzy and the CxL-112 (Wizzy is more full sounding, warmer midrange; CxL-112 goes deeper, though not as full through the low-mids, and has scalpel-precise clarity). If you are talking a single cab, the CxL-112 definitely does a low B with more gusto (and can be pushed harder both volume-wise and bass-boost-wise) than the Wizzy. However, two Wizzy's definitely surpass the single CxL-112 in overall low end, including low B. Somewhat surprisingly, one Wizzy and the CxL-112 does not sound significantly different on the low end, and the mids are not really as cohesive as with two Wizzy's, though you do get some more control on the high end via the CxL-112's tweeter. Overall, I preferred two Wizzy's to the mixed 1x12 combo.
As for upright, the Wizzy has a very warm, musical presentation, with a hint of added bloom to the notes, but plenty of precision, and a nice, earthy fullness. I liked it a lot. The CxL-112 did not have the bloom (which is a good or bad thing, depending on your personal preference and what room you have to deal with), and was not as full sounding, but had a very articulate sound that seemed to emphasize the sound of my left-hand fingers, but not in a harsh way, which I found somewhat unusual. Normally, I consider too much "fingernoise" to be a bad thing, but it was more of a revealing thing than an obnoxious thing with the CxL-112. Two Wizzy's with the upright was sheer joy!
For reference, I was using my iAMP 800, my 5-string is a modified DeArmond Pilot 5 Deluxe (with Bart p/u's and Aguilar OBP-1), and my upright is a late 40's (estimated) Kay, with a Barberra Bridge.