If you're in the market for a new laptop, you won't be missing all that much by going with an older Whiskey Lake-U model. The hexa-core Core i7-10710U looks to be the only Comet Lake-U SKU to offer a significant gen-to-gen raw performance boost.
https://www.notebookcheck.net/Three-generations-of-14-nm-Core-i7-10510U-offers-just-20-percent-faster-multi-thread-performance-than-the-average-Core-i7-8550U.450367.0.html