If you play a Mark side by side with most other amps, that's telling as well.
I had a Mark IV Rev A for a short while (when you could still get them for ~$1k mind you) and while it did do 2 things very great (cleans and lead), I actually was gravitating more to my 5153's 50W 6L6 blue channel for most rhythm stuff, and I noticed that my go-to-lead tone was also reasonably achievable with the 5153's red channel (after some serious lower gain tube swaps though!)... so, I got rid of the Mark IV.
But of course, some time later, there remained a Mark itch, and I settled on the lil' V:25, since it had 2 things that bothered me in the IV;
portability and the Crunch mode.
FWIW, my Engl Savage is also middy AF, so I keep the mids at 10 'o clock AT MOST, usually lower, crank the bass (it still remains tight!) and sometimes throw a Source Audio graphic EQ pedal to scoop it a bit, and my experience there, is what some of you have been mentioned here as well:
initially it sounds awesome and crushing, but then ear fatigue sets in and after a while you find that the EQ pedal one way or the other makes the tone less organic. There's a very mild setting I use on the SA EQ, which I can tolerate longer and usually when I switch it off, the amp on itself sounds too middy again, but if you don't use the EQ pedal for a while, the amp by itself becomes your reference.
I mean, there's a reason those BBE Sonic Maximizers were a HYPE and not a long lasting staple on the large number of racks and pedal boards that featured them once. I also have a mint Boss EH-2 Enhancer in a drawer somewhere...
