My quick review of the FIIO FH5 and FA7
DAP used: Questyle QP1R
Tips used: medium foam supplied in FIIO box
No break in time was given (yes I know this can make a difference...I just didn't want to wait)
I've been demoing the FH5 and the FA7 for just over 10 days now. There are aspects of both that I really like but still can't decide which ones I'll keep... (if any due to the new and yet to be released FH7 coming soon!). I'll agree with most that the complete resin chassis of the FA7 feels much better to the touch than the aluminum of the FA5...certainly not a deal breaker though. From a fit standpoint personally I can go either way. The FH5's aluminum is always a bit cold to the touch upon first insertion but quickly goes away. My ears don't seem to have any issue with fitment or insertion depth...again, for me, either fits nicely in my ears. I do like that the FA7's are notably lighter. Comfort on both are similar in my ears. As a quick note...the FH5's do leak quite a bit of sound (my wife noticed this yesterday when she was sitting across the couch from me). She said that this was quite annoying!

. As a comparison and in the same location the FA7's could not be heard at all according to her. So note this if any of these are to be used in an environment where being quiet is a must! Isolation on both is quite good from the user standpoint. I would think they would be quite good in an airplane setting... one place I will be using these.
Sound
Both have their pros and cons. On a whole, I prefer the sound signature of the FH5's better. The bass impact/punch is hard not to like. I also prefer the amount of high end sparkle. They also have better dynamics and overall impact...this is very difficult not to like and I would say is the main reason I prefer the overall signature of these better. However, the highs at a moderate to loud volume, CAN be a bit too much or very slightly harsh at times. Source material and recording quality dependent. When listening with the QP1R and adjusting the EQ, this harshness can be eliminated or significantly reduced.
Regarding the FA7's... These are considerably smoother overall and not fatiguing. The main dislike of these is the midbass bloat, especially in male vocals and in some poorly recorded music. Yes there is more detail here and it is noticable over the FH5's...which does make this comparison more difficult to choose one over the other. The bass is good and slightly more detailed than the FH5's but these do not have the impact or dynamics of the latter. The overall high end is not as pronunced as with the FH5's but still more detailed. The FH7's are, as others have said, slightly more closed in or up close sounding and not as open or as spacious as the FH5's...choose your preference here. When adding in some EQ on the QP1R some of the midbass bloat and lower level of the high end sparkle can be addressed and does make enough of a difference to matter. If you are OK using an EQ I do suggest trying this as an option to tailor either of these to your liking. Ideally I'd like to find a set that does not need any EQ but...
I am waiting for a few cable options to arrive to see what changes if any I will see from those. I bought these before I knew about the upcoming release of the FH7's...maybe I'll just return both of these until those come out and are available to try!
Thanks for listening, Brian