Looking for Blues with High Fidelity

+1 for Lucky Peterson😎

That's a tremendous list of recommendations, with numerous +1s from me that's too long to list

A couple of my off the beaten path faves that hit the mark on SQ

Ronnie Earl Still River released on Audioquest

Lightin Hopkins by Lightin Hopkins released on Folksway in 1959

ZZ Top One Foot In The Blues

The SQ of the playback of the first two Dire Straits albums are very well done

The Black Keys do a great tribute to Junior Kimbro on a disk named Chulahoma

And while more southern rock, you can't go wrong with any of the live Allman Brothers material as most of it is dripping with blues influences

A couple of notable go to cuts from the Allmans that I use for reference when testing new gear are 

Hard Times on Hitting The Note

Instrumental Illness on Hitting The Note

An acoustic version of In Memory Of Elizabeth Reed on A Night With The Allman Brothers 2nd Set

Someone who likely has never been mentioned on Audiogon before, the late Jump Blues pianist/singer; H Bomb Ferguson. Unfortunately, his records can;t live up to his live performances.

Mighty Sam McClain  Keep on Movin'  I use this as a test CD.  Dynamics and soundstage are tops regardless of genre.

Here's some cuts that come to mind:

Ronnie Earl and the Broadcasters- Kansas City Monarch

Stevie Ray Vaughn - Tin Pan Alley (Roughest Place I've Ever Been)

Jennifer Warnes- Invitation to the Blues

Satori in Chicago - a song by Noah Wotherspoon