The X-5 has sloppy slide-to-frame fit, no better than a regular P226, and the CZ barrel isn't tightly fitted. The CZ exterior finish is rough also. The trigger has alot of creep.
Many of the folks who seem to know about these things say a tight slide to frame fit isn't all that important
if there is a good slide to barrel lockup. That way the sights and the barrel are always pointing at the same thing. That's why a polymer-framed gun doesn't do well in a Ransom Rest test, but can be very accurate when fired manually. (Slide to frame fit seems to be of greatest concern to 1911 shooters; you don't hear it mentioned that much by other shooters.)
As for the CZs -- you seem to be someone who hasn't had much experience with the top-end CZs. The trigger on the ones I've handled didn't have a lot of creep. And they are very adjustable. (I have a 75B SA with the two-way adjustable trigger, and its a lot like a 1911.) What you describe seems to be true of the DA/SA models, but the TS isn't DA/SA.
The CZ's barrel lockup design is such that it doesn't need a bushing to lockup consistently -- none of the CZs do. The design puts all of the rigidity in the lockup function at the back of the action. The barrels don't move until it begins to unlock during the recoil cycle.
I haven't seen many S&W 952s in competition. And they'll never cut it in IPSC -- they don't hold enough rounds. They could do fine in IDPA, but they don't show up there much, either. (Several of my IDPA buddies had them, but never tried them in IDPA. Don't know why.) I know they're nice guns, and they're very attractive. With the S&W 52-2, the safety was awkward; is that true of the 952s, as well?
I think the SIG X5s are fine guns, and would love to have one. They seem to be a worthy successor to the P-210 line. (I had a P-210-6 a few years back. It outshot my S&W 52-2... but the 52-2 was prettier.)