In a recent presentation to the Madison DX Club, Rob Sherwood NC0B gave a talk on transceiver performance on the HF bands.
As Rob outlines, receivers are now so good that the real limitation is with the transmitters. Note that receiver limitations due to someone else locally using an amplifier.
The 66 minute video is shown below...
The first half is about receivers and Rob talks about transmitters from 33:00 minutes onwards.
1) NC0B's website - Sherwood Engineering