Yes, with regards to performance, Nvidia GeForce RTX 2080 SUPER outperforms, Radeon RX 6600 XT by 19.8%.
When it comes to power efficiency, RTX 2080 SUPER falls behind with an efficiency score that is 46.5, -23.3% lower than that of RX 6600 XT 60.7. Consuming 160 watts, RX 6600 XT has better power consumption to peformance ratio. The efficiency score is calculated by comparing the benchmark score with power consumption
RTX 2080 SUPER price to performance rating is lower than RX 6600 XT's by -86.4%. Here is more in depth overview of the price and used prices of RTX 2080 SUPER Price History and RX 6600 XT Price History