14900k: https://www.techpowerup.com/review/intel-core-i9-14900k/
14700k: https://www.techpowerup.com/review/intel-core-i7-14700k/
Very small performance increases in gaming (1-2%), only notable thing is a very impressive temperature reduction for the 14900k (ie: in gaming, the 14900k is running over 7% cooler at stock than the 13900k, and over 13% cooler when under full load in synthetics). Intel is keeping 1:1 pricing with the prior chips, so this is "fine" I guess.