I still have a couple I bought in about 2012 & 13 or so. A 3-9x40rz600 on a Merkel K1 7RM, and a 4.5-14x42(?) RZ800 on a Win 1885 in 300H&H, I see no good reason to change them up, really nothing to change up, great glass, good mechanics. I've bought one Swaro Z3 3.5-10x42 since then, and would buy that again too, it blew the doors off a Leupold vx3 that I bought along with it and sold afterward.
Apparently the Conquest MC was actually made in Japan, imported by Zeiss Germany. I would happily buy another one.