Ayre K1X vs K1Xe

I own and love the K1X. I've had it for 3 or so years and have no itch to change. It was the most solid upgrade I've done to my system ever. I have tried lots of gear over the years and have really settled in with what I own now. If I learned anything with all the gear swapping I did was that usually you just get different sound not necessarily a better one.

That said I am curious to know what effect the E upgrade would have on my preamp. I'm not looking for just a little more air or extension but if I'm missing something important here I'd like to know.

Thanks, Ryan