The JST Jeff Loomis certainly nails the high gain sim genre but could it also crunch in the Marshall tones, well here it is..

My tests are sim dialled up to capture the best sweet spots, this amp is on the top ten tier over many plugs, my top ten tests are
1 How Benson Tonality
2 Kuassa Vermilion
3 Kuassa Caliburn
4 Kuassa Creme
5 JST Jeff Loomis
6 Plugin Alliance Fuchs II train
7 Softube 1959 Plexi
8 Softube order One
9 Softube JCM800 2203
10 Softube Marshall Jubilee
The rest are sims that have more high gain then sweet spots for crunch but deliver crunch
-JST Toneforge Ben Bruce, Guilty Pleasure, Menace all do well.
-Mercurial (their JCM )
-Neural DSP (almost all)
The rest sound very much the same or can be simulated by the top ten listed here.

JST Toneforge Jeff Loomis +bx_yellowdrive aka Boss SD1

Guitarists,Vox, Composer, Producer, ENG, Electroforming Artists, Cinest

This soundcloud account is dedicated to dialing up the crunchiest Marshall sweet spots in  amp/sims, sometimes adding the bx_yellow drive aka Boss SD1.

I tested these sims and amps with 1 Riff and some tracks so you can all hear the sims character after dealing back into the sweet spots.

As of August 2022 the top ten tier over many plugs are:
1 Howard Benson Tonality
2 Kuassa Vermilion
3 JST Toneforge Guilty Pleasure
4 Kuassa Caliburn
5 Kuassa Creme
6 Softube 1959 Plexi
7 Softube Murder One
8 Softube JCM800 2203
9 Plugin Alliance FUCHS II Train
10 Softube Marshall Jubilee

The rest are sims that have great crunch as well as other tone sim attributes 
-JST Toneforge Ben Bruce
-JST Toneforge Menace 
-JST Toneforge Jeff Loomis,
-Softube Softube Marshall KK 
-scuffhamamps S-Gear
-Plugin Alliance Fuchs Overdrive Supreme50
-Plugin Alliance Suhr PT100
-Plugin Alliance Friedman BE100
-Plugin Alliance Friedman Buxom Betty
-Plugin Alliance Friedman DS40
-Mercurial Spark
-Neural DSP Cali, Tone King
-Nembrini BG Extacy
-Nembrini MRH810v2
-Overloud  TH-U 

The rest offer some variations of other amps well but did not sound any where near as close to the amps listed above.
-Amplitube
-PRS
-Peavy
-Positive Grid

I have not tested blue cats and a number of upcoming competitive plugins yet.

JST Toneforge Jeff Loomis +bx_yellowdrive aka Boss SD1

Gavri'el Rāfāʾēl