Hey, you got the Pinephone which doesn’t focus on the openness like the Librem 5, it’s very similar but has got more proprietary blobs.
If you’re asking on a more widespread scale I won’t be able to help much since I don’t understand much of the ARM world (but I don’t have much problems on x86/x64 systems) but I think I saw somewhere on the web (maybe it was here or maybe it was someone on the comments on Phoronix idk so take it very lightly since I can’t source anything) someone that said that the Librem 5 in raw power could be compared to a 2015 flagship phone.
But I don’t really know if you can compare Android to pure GNU/Linux since the later one is supposed to be lighter than the first one.