I know that CMOS sensors appeared in the beginning of 90s, and evolved up to 2000s. I'm mainly talking about high ISO photos quality. For example, Canon 5D mark 3 has better results in high ISO tests than Canon 5D mark 1, and both of them has the same FF CMOS sensors.
Have CMOS sensors changed at all since 2000s? Do sensors continue to evolve nowadays? Why new DSLR cameras with the same sensor have better results than old one?