So, like anything, there are people who like the SF5Pros and people who don't.
I am in the camp that loves the SF5Pros. I have found them to be great IEMs. My favorite signature overall is along the lines of the DT770/80. I find the SF5Pro a great compliment when I can't have hamburger-headphones on my head. Sure, it does not have the extreme highs or extreme lows of the DT770/80s, but it is not fair comparing a fullsize 'phone to an IEM when there are physical limitations to be considered! Overall they strike the balance that I prefer in an IEM and I'm happy with my purchase.
I am in the camp that loves the SF5Pros. I have found them to be great IEMs. My favorite signature overall is along the lines of the DT770/80. I find the SF5Pro a great compliment when I can't have hamburger-headphones on my head. Sure, it does not have the extreme highs or extreme lows of the DT770/80s, but it is not fair comparing a fullsize 'phone to an IEM when there are physical limitations to be considered! Overall they strike the balance that I prefer in an IEM and I'm happy with my purchase.