*YES!* I sold my MK-101 (cardioid), so I can go ahead and order a matched pair instead, and/or that MKL-2500. I really wish I'd been smarter and bought my 2nd pair of MK-102 capsules as a matched pair of microphones from Oktava Shop, instead of just the capsules from a retailer in Australia. Then I would have got a 2nd MK-101 cardioid capsule, obviously not matched to the one I've got, and had 2 more pre-amps plus the 2nd set of MK-102 capsules, and a pair of 101's (un-matched) for a much lower price. But it's fine, I end up paying more but my two 101's will now be matched.
The price for MK-101 MSP is relatively high for Oktava 100-series but still good. I considered a pair of MK-319's and I know I would have liked them, but for the amount I'll use them it makes more sense to get 2 101 capsules and a pair of pre-amps etc instead. I wouldn't have done it if I hadn't sold the single 101. Which appears to be a good one, from my limited testing and its FR graph, very flat. All the late-production Oktava equipment I've bought has been good quality with none of the problems I've heard of with older mics, and all seem to be low noise with an excellent measured FR. Some have testing stickers for 2022, the 101 I sold from March. The MK-105 MSP was December 2021. I haven't used them much yet but they've sounded good when I've tried them.
I could get an MKL-2500 about 8% cheaper from Thomann now but since I want to order the 101's I might as well only pay for shipping once. I don't mind giving O. Shop a sale either. This will complete the collection of Oktava condensers I wanted, and it will be a fairly comprehensive set. As I've said I decided to get them now as it's possible the price would only rise as supplies run out. I wish I could audition the Mini Tube Pre-Amp, but without I don't think I want to risk it. I have heard 2500 recordings and I know I like them. The 33mm capsule of the MKL-2500 is only available with that mic AFAIK.