I have a small Regular that has had a lot of use.
I have never had any issues with corrosion or pitting. Obviously some other guys have. This knife is +20 years old, and well-used, and it has not been an issue at all.
I do find it more work to sharpen up BG-42 when dull. If I keep it sharp, it doesn't seem to be a problem at all, however. So I learned that lesson and keep it in mind.
On the other side, I think that BG-42 does hold a good working edge longer than S30V. Not a hair-popping, laser-splitting edge, but a very sharp, very serviceable working edge. Overall, I prefer it to S30V and even more so to S35VN, though it's a close call between them and I may be affected more by sentiment than actual data on that comparison.
I wouldn't sell the BG-42 Sebenzas that I have at this point - I haven't checked prices lately, but unless they're really stratospheric, I like the ones I've got. It doesn't hurt that they're Regulars and that style hasn't been available for years. Yeah, so perhaps I could turn one BG-42 Regular into two or even three current Sebenzas - but how many knives can I use at once? And how many user Sebenzas do I need? And if I'm going to admit to collecting or at least accumulating things, isn't it better to have BG-42 Regulars than generic current- or recent-production Sebenzas (or other CRK folders)?
YMMV, of course.