I would say with 8 different Sprint/exclusive Para 3s you probably have the bases covered. Whether you need one or not is for you to decide, but as far as CTS-XHP goes it's basically a more stainless D2. It's a fairly middle of the road "super steel" with good edge holding ability while still being relatively easy to sharpen. I've been down the road of buying every available steel for my knife of choice (PM2) and you come to a point where you have so much redundancy that there's no point in getting more unless you just want to collect them all. Personally I settled on Cruwear as my steel of choice and now that's the only PM2 I use. You just have to figure out what properties you like best and find the steel(s) which most closely match your preference. XHP is no magic perfect steel, because there isn't one. They all are just different balances of the same properties.
Very well said! Totally agree. I suppose if you love orange (which I do) it's certainly worth considering.