Analyzing The Silicon: Die Size Estimates and Arrangements - The Intel Skylake-X Review: Core i9 7900X, i7 7820X and i7 7800X Tested
AMD Ryzen Has A Smaller Die Size Than Skylake Intel Processors - Zen Architecture Good for Desktop and Server Market But Not HPC
SPECULATION: I tried to make this little comparison on CPU die sizes including Ryzen, thanks to the recent leak about the size of the 4 core ZEN cluster : r/Amd
Socket, Silicon, Security, Overclocking, Motherboards - Intel's 10th Gen Comet Lake for Desktops: Skylake-S Hits 10 Cores and 5.3 GHz