Intel's XCC die is 694mm^2 for a 28-core, while Zen / Zeppelin is 213mm^2 for an 8-core. Intel's XCC 28 core is around 25mm^2 per core, while AMD's Zen is 26.6mm^2 per core... suggesting a slight advantage to Intel!

Furthermore: Intel's XCC die has 28-cores. When defects come into XCC, Intel can simply disable those cores and sell them for cheaper. For example, Intel's Xeon Platinum 8160 is a 24-core. Presumably, 4-cores are defective but Intel can still sell it for $5000 or so.

So a defective product would require a manufacturing defect somewhere critical. But individual cores can most certainly be disabled during the manufacturing process and sold as a lower tier product, like the Xeon Platinum 8160

As such, Intel definitely has good yields, at least on 14nm production.

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The main advantage is that AMD's strategy works way better when yields are poor due to a new process being not fully understood. But as defect rates drop, Intel's monolithic strategy seems to have slight advantages over AMD's. (Remember: Intel's cores are slightly superior in IPC, have slightly faster caches, and AVX512 enabled).

AMD's strategy is definitely good, but I don't think Intel is really that far behind.