Pre-LCI F90 M5 AWD vs G80 M3 Comp AWD
https://e89.zpost.com/forums/showthread.php?t=1927492
Thread above shows my thoughts on this having had both the G80 for 2 months and just recently traded it for the LCI F90.
To summarize: V8, Luxurious, More room, very few sacrifices in comparison. The M5 imo is just better for my use and situation. Hope that helps!