I use the "Schoeps M-S" which is the CMC64 + CMC68. I am using the connectors between the CMC's and the caps now. It makes a smaller package to shove in front of the performers. I like running it. I decode in post, too. But I can decode during on my SD 7xx. Either way I do get to fiddle with it in post. I just ran a recording of Freak Mountain Ramblers doing a benefit in Cannon Beach, OR. I was in very close, right at the edge of the platform. So the F-8 was good. I narrowed it in post by reducing the F-8 some and pumping of the card to get it more "in front" than spread out. I also fed in a board tap, mono only, and folded that in at a low level. Too high and it screws up the stereo effect. The band's PA's sucked and distorted a lot but it was a good night.
The plus is being able to play with it in post. If I had run X-Y I could also play with the spread using the VoxNGo MS plugin which will take ordinary stereo tracks, make the MS, and then decode them back in the ratio you select. Yes, you can preview the new ratio. This makes using the MS a moot point, I suppose, but I stick with it anyway. I am not sure I could have been is as close as I was with the MS using XY last night. I know I could be in that close with MS.
Try it, play with it and have fun. You can try running the teo Mk4's and playing with the VoxNGo decoder, too, to see how you like it. You may no need a Mk8 to do faux MS.