I couldn't say. I didn't notice any difference from my 22/45, but I really wasn't trying to compare them. Maybe I'll take those two and my pre-Mk. I out this weekend and try 'em.
I know that slabside is just a marketing gimmick, but I sure do like the looks of it. Oh, and our local grocery/housewares/shoe/jewelry/hardware store has one of the aforementioned stainless versions in its display case. Yeah, sure looks nice, too. But the price tag is well over $400.