Don't know about the CZ 75 Shadow, but it could be a reasonable comparison to SIG's P226 X-Five Match - at a much lower price. Both X5 and Shadows are difficult to find.
GunBroker lists a good number of new Shadows that have sold in the ~$1,400 price range.
GB lists no new, and only 2 used SIG X-Five Match sells this year. One for $3,875 and another for $4,000. An unusual new close relative, X5 Level 1 sold for $2,999.99 in February '17 by Osage County Guns. Wonder where that gun has been hiding??!!
If you could find a LNIB X5 Match at ~$4,000, clearly it's rarity value would be as significant an element in that decision as its shooting merit to win your good esteem. Something to think 'bout!!
I wish I owned a X5 Match - But don't, and these will have to do...
Cheers