The 85/15's are great - it would bring your guitar up to the 'modern' release spec. I think they have great clarity and love them in my Custom 24. If you are unsure, you could always try out a new CE22 or even the CE24 but be aware that if you try a new CE24, the Neck will sound a bit brighter as its bit closer to the bridge. Trying a new CE (if you can get to a shop that has them for sale) would at least give you a good idea of how these PU's could sound in your own CE. You will also get the opportunity to hear them split as well.
I find it difficult to recommend PU's to anyone. Because tone is subjective and PU's can differ in different instruments and rigs, it doesn't make it easy to recommend any PU's. At least with the new CE's and the fact they come with 85/15's, you can get an idea of whether or not these would be what you are looking for in your own CE. The 85/15's are described by Paul as the Pick-up he wished he had made in 1985 (hence 85 - with 15 being the year they were created of course) and they are the Pick-up of choice for PRS to put in the current Cu/CE22/24 models.
Again, not saying you should put 85/15's in your CE, but that it would be the PU in a new CE22 today. That also gives you a great opportunity to actually hear the PU for yourself in a very comparable guitar - not something many people get the opportunity to do when considering changing PU's. If you were swapping to SD's or DiMarzio's for example, you would struggle to find a CE22 with those PU's fitted to hear whether or not these would deliver the sound you are looking for.
I haven't got a CE myself but I haven't heard a 'bad' tone from any of the demo's and reviews of the CE's with 85/15's in. Whether or not its the tone you are looking for, I don't know but at least you have the opportunity to hear these before you commit to buying. If they aren't quite what you want, at the very least you can eliminate them from your list. It may also help you get closer to the tone you want - if its too bright or you for example, you can look for something darker, too 'modern', something more vintage, not hot enough something hotter.
Point is, you have a great opportunity to hear how these PU's could sound in your guitar before you buy and can use that experience, along with your current PU's to narrow the search down if the 85/15's aren't quite right. Whether or not PRS do have the right PU you are looking for to sell is a different matter of course. Either way, getting out to try an 85/15 loaded CE, hearing them yourself in a comparable guitar to yours, has got to be better than buying PU's and then not delivering what you hoped for in your guitar or wondering whether a different choice of PU may have been better.
