I'm surprised how well the 3700x holds up against the 9900k, especially when comparing frametime performance.
I don't think anybody expected zen2 to take the crown, but this is good. The 9900k cost 580€ at launch and the 3700x is a 350€ CPU after all. The difference seems to be around 5-8%, with some outliers like New Dawn and Metro Exodus (~20%). But you have similar outliers for Ryzen with Kingdome Come and Resident Evil 2. The 3700x is outperforming the 9900k by ~10% here, despite a clock disadvantage.
I'm impressed
Finally some worthy competition. The r5 3600 should turn into the new i5 2500k. The go to CPU for the next 1-2 years.
Good performance, good price at 200€, cheap mbs are available, enough headroom. At least until those 8 core next gen consoles arrive.
For me: Not sure the "premium" for the 3800x is worth it, probably not. 3900x is still intriguing me, but I think I'll stay on 8 cores till Q1/Q2 2021, after PS5 arrived. By then 12 and 18 cores should be better in every regard, maybe GPUs will also start asking for PCI-E 4 and I'll need a new MB anyway.