Here are my thoughts on 70K after recently fitting every model of skates out there. Overall, I would classify all the CCM skates as different variations of medium fits and Bauer skates as accurately advertised in terms of fit. FYI my foot shape is: med forefoot, med mid-foot, med/narrow heel, med instep.
70K: I would not consider the 70K a low volume boot as claimed by retailers. First thing I noticed is that it has a spacious forefoot and toe cap, both in terms of width and height. Heel lock is really comfy - snug given a ton of memory foam to lock in heels, but soft enough to adapt to wider heels.
Medium instep edging very slightly towards the shallower end, but the flexible lacing area and tongue really allows it to accommodate larger insteps. Easy to get knee bends and just incredibly comfortable overall. I do feel the boot will expand over time with regular use everywhere, so wouldn't recommend these as option #1 if you have true medium profile foot. Even if they feel cushy initially, I'd check other skates for a more anatomical, snug, glove-like fit.
Target foot profile: wider forefoot and enjoy more toe space (this is a must), med or med/wide for mid-foot and heel, medium or med/high instep. Jetspeed, Supreme, and Vapor skates all felt like they had less overall space than the 70Ks. Width for 70K comparable to Tacks imo, but very different instep and overall feel especially at the heel.