You need to hear it youself, at home for few days, Roxanne and Mentor, 2 totally different IEMS, the Rox has smooth mid and low hitting bass when recording calls, with some music, the treble felt like someone use a knife cut the top, it has good soundstage, width and depth, it just song weird with it's flat top trebles.
That is just me, I know people in this forum who love their Rox to death. I personally like colored sound sig, Roxanne sound very nature.
Mentor's sparking highs is unique, highs are extended but not harsh, it is fun to listen, and I mainly go after the fun.
I only listened to the K10 at the show, sound very good but nothing excited me.
I am sorry I couldn't offer more help as I only have limited knowledge in my short headfi journey.