Bought a secondhand pair of 8020B in good condition about 8 months ago, still having trouble warming up to them, very used to my HS5.
Something is odd about the lowend on the 8020, they have substantially more bass than the HS5 but dont go as low, and this seems to create some confusion in the low mids. Wind up with a mix with a low end very tailored to the speakers and the low mid stripped out. Not sure if I can get used to this.
They have a ton of depth and detail, I can get used to that, maybe a larger size speaker from genelec would be better. 8020 reveal space in my mix that can be filled out, that I thought I didn't have on HS5. They do contrast well with HS5 on a monitor switcher to keep things in check, but overall things done on HS5 translate better to 8020 than the other way around for me thus far. Hard to compete with like a decade on HS5 though.