Graf Peakspeed Experiences? PK4700 and PK7700

TL;DR: What is the difference in the PK4700 and PK7700, and does anyone have any experiences to share about either of them? Because I can't be simple and just be happy with CCM or Bauer, and I can't afford True's... For many years, I've only ever really been happy in Grafs. After a year in CCM, and a couple of false starts in Bauer's, I'm considering some Peakspeeds. However, I cannot find the difference in the different models of Peakspeed. Has anyone done a comparison of the PK4700 a

For anyone reading this in the future, as there seems to be very little information out there on the Peakspeed lineup: I went with the 7700s, and after a couple of small, resolved issues, am quite happy with them. The fit, to me, is extremely similar to the G75 XI (blue piping, not green). Coming out of Jetspeeds that I was in last season, they feel quite similar, but with more forward flex and a slightly lower ankle (I drop an eyelet in the Jetspeed, not in the Peakspeed), and are roomier