The NEC V20/30 series were significant advances over their Intel equivalent (basically all the 186 features plus more in an 8086/8 compatible package).

C&T had some super-386 chips that apparently barely made it to market (38605DX), and the Cyrix 5x86 (most of a 6x86) is substantially different from the AMD one (which is just a 486 clock-quadrupled)