I own a CZ85Combat, an SP-01 and the Shadow. I shoot mostly IDPA but dabble in IPSC. Here is my take:
The Shadow, coming as it does, with FO front sights, competition hammer and a factory tuned trigger shines in IPSC Production division. IF you take the time to reduce it's weight legally by, replacing the mainspring with a lighter CZ mainspring, replace the mag brake (the flat piece of metal that protects the mainspring from the mag) with a CZ75B replacement piece and trimming it, and replace the grips with Dennis Marshall grips your Shadow will weigh in at 39oz. This makes it legal for IDPA SSP thence ESP.
The SP-01 I have, came with night sights, great for defensive situations but for playing the games not as good as FO sights IMHO. The trigger pull is heavier due to the Firing PIn Block, hammer angle on the sear, and heavy mainspring. A gunsmith can polish the firing pin block, re-cut the hammer spurs that contact the sear, and you can replace the mainspring with a lighter CZ mainspring. For competition the gun is ready to go. For IDPA replacing the rubber grips with plastic will get you below 39 oz to play in IDPA SSP/ESP divisions.
The SP-01 frame is not the same frame as the Shadow has. The gun weighs less, the frame is cut differently. The gun does not have the competition hammer for what that is worth. The gun comes with a firing pin block.
The CZ 85 Combat does not have a firing pin block and a gunsmith can give you an outstanding trigger every bit the equal of the Shadow. My gun came with the three dot arrangement. The front sight has been replaced with red FO. The gun is lighter than either the Shadow or SP-01 and really balances in my hand better than the other two. For me the downside is, I cannot reverse the mag release on my CZ 85C. I am right handed and prefer the mag release on the right side.
All three guns are well made and are very competitive for playing the two most active action shooting sports ie IDPA/IPSC.
For IPSC I would rate them:
1. Shadow
2. SP-01
3. CZ85 Combat (75B has a firing pin block but is essentially the same gun without duel controls). The CZ85C does not have the firing pin block.
For IDPA
1. Shadow (Provided you get it down to 39oz or less)
2. CZ85 Combat*
3. SP-01 (Provided you get it down to 39oz or less)
*The Combat gets the node over the SP-01 as targets are generally closer in IDPA in the main, and being lighter and for me better balanced. I seem to be able to drive if faster.
All of the above is very subjective. You will have to decide what you want to use the gun for, shoot them all and then decide. The CZ 75B and it's offspring are very well made guns with a world wide solid reputation. It is a standard which other makes are often compared to. You can't go wrong buying any of the variants.
Take Care
Bob