Linux 5.8 is one of the biggest releases of all time as pointed out by Linus Torvalds. However, unlike other releases, you may not see a lot of eye candy changes for an average user to understand.
Overall, the Linux kernel 5.8 release introduces a bunch of driver support, security improvements, and optimizations.
Just to put it in perspective, Linus Torvalds did mention this with Linux 5.8 RC1 release:
But again, 5.8 is up there with the best, despite not really having any single thing that stands out. Yes, there’s a couple of big driver changes (habanalabs and atomisp) that are certainly part of it, but it’s not nearly as one-sided as some of the other historical big releases have been.