Purchased the 5900X at the MSRP price of £509.99. Quite happy with that as I have been biding my time after the initial batches sold out at launch and then the prices have been coming down slowly.
Moving from a 3950X so losing 4 cores but gaining IPC and raw clock speed. My workload (video editing in DaVinci) hits around 8-10 cores at full load so I won't miss the extra cores, but should notice (time will tell of course) the extra oomph on the cores being loaded.