I had the Fenix and it is definitely comparable to the CFV, more so than the Crafty compares to the CFV. In short, I prefer the CFV over the Fenix because it has a better build quality and it offers more much control over your experience.
I think the CFV has better flavor, plus full temperature range, a better mouthpiece, the removable chamber rings and it seems to heat up faster if I remember correctly. I thought the Fenix was a sweet little vape, especially because it was so cheap and I got mine directly from China for 80$ with shipping. The Fenix features a "boost" like mode that I think either increases the temperature slightly or adds conduction heat to the chamber but both the CFV and Fenix are full convection devices. The Fenix had a better draw and I could cover the air intake on the bottom of the Fenix and you could not draw at all but I can still draw slightly if I cover the CFV air intake. Also, the Fenix came with a Concentrate Can, so it was a dual use vape, although I never tried any Concentrates with the Fenix, so I cannot comment on it's ability and as of now, the CFV is only for dry herb. I definitely seemed to get more visible and thicker vapor from the Fenix but the flavor is not as good as the CFV, although it still is pretty good. The vapor is smoother on the CFV but may be because its thinner and less visible. I would recommend the CFV over the Fenix but if your looking for simplicity, then go with the Fenix and if you want or like to play around with temps, draw methods, different chamber rings etc then the CFV is your vape. Boundless seems like a great company and they are always introducing new goodies like a Aluminum Chamber for the CFV that will create much more conduction heat and they have a Waterpipe adapter, a chamber loading funnel, plus the unique chamber rings that offer a customizable experience. Hope that helps!