The new mobile Zen+ Ryzen 7 Pro 2700U (4.0/2.3 GHz) will be just marginally faster than the outgoing Zen Ryzen 7 2700U (3.8/2.2 GHz). When compared to the Intel Core i7-8650U, however, AMD is promising up to 258 percent faster graphics performance in certain applications. More significant gains in CPU performance are not expected until the "proper" third generation Zen 2 series refresh.
https://www.notebookcheck.net/AMD-details-12-nm-Ryzen-7-3700U-Zen-SoC-to-compete-against-the-14-nm-Intel-Core-i7-8565U.415941.0.html