FWIW, to my knowledge, I've never heard a HAZ labs Mutron at all and, recordings and live shows aside, have never personally played a real Mutron. My "Mutron" is below (Line 6 M13 model). However, I'd contribute this to the discussion based in part on a book I just finished reading, written by a behavioral economist, entitled Predictably Irrational. And that is that we all literally - not figuratively, LITERALLY - experience reality differently as result of predictable yet irrational human responses to product information, advertising, and related expectations.
For example, if, upon listening to a floor effect unit, we are told in advance that it does not use the same circuit as the original and may be misleadingly designed, we will literally hear it to be worse sounding than if we were told beforehand, even if inaccurately, that it is a true clone.
For this reason and based on much similar reading and experiences in my life, I try very hard, myself, when listening to any piece of gear, to put aside all prejudices and expectations and listen as objectively as I can. When I've done this with gear, even though not in true double-blind experimental designs, I've often had to admit such things as there may be little if no objective tone improvement between a $4K boutique custom shop Tele and a $500 import.
And this is not the least bit unusual of a finding. As the author of Predictably Irrational demonstrates empirically, indeed, it is the norm, be it for chocolate, aspirin, wine (all 3 of which featured in the author's experiments) or gear.