I've been in the same place Jeremy but only 'window shopping'
Man there was a time when even though I had a camera and lenses that did everything I needed I was constantly on review sites and especially comparison sites like dxo mark etc comparing low light and DR scores, Perceptual Megapixel scores with various other lenses on the bodies I owned or my lenses on other bodies etc, I will admit it became like an obsession but I am a spendthrift so I never acted on it ha ha
I was lucky enough back when I had a Nikon D5300 to print a portfolio of shots taken by it with the Sigma 17-50mm F2.8 EX DC OS HSM and even up to really large print sizes like A2 and more they were amazing, even some that were cropped. And I mean like lacking in zero way, sharp as heck, amazing depth of colour, contrast etc
I said to the printer 'wow I'm so surprised how well these came out' and he said
'You're using a good 24mp sensor and good glass. As long as you're using good shot discipline you shouldn't expect anything less than this and even a lower MP body with good glass will do the same.'
So now I've seen the results in a large print and not on screens I'm satisfied.
I was worried about my X-T2 would it be so good as the Nikon as DXO don't score Fuji's and I saw a photographer do a gallery exhibition online and in some of the prints he said he could see the 'limitations of the Fuji sensor' in a couple of shots, though I couldn't.
But then I saw this landscape photographer - probably the most demanding genre for IQ - on youtube do an A0 sized print comparison between the X-T2, D850 and GFX 50R with similar primes in terms of focal length etc and while when he was really peering closely at the prints on a table (not how you'd view an A0 print) there were some differences in the extreme corners between the X-T2 and the D850 and the GFX 50R did resolve much more detail and had amazing tonal shifts etc - he still said he'd be happy with the X-T2 prints for display etc. These were only differences you could notice if you were looking for them and when you look at an A0 poster on a wall not many people do that, and if you were standing with your face to the poster.
That's when I stopped worrying completely.
There are differences like between my Nikon D5300 and my later purchased Canon 100d, the Canon at ISO 3200 was the same as the Nikon at ISO 6400 so for low light shots not as good, same goes for my LX100 at ISO 1600.
Some lenses do fare not as well as others when facing strong light like my Fujifilm X-100 T which flared as will my LX100 lens at night VS my Canon 100d with 24mm F2.8 STM which never did, neither did the Sigma 17-50 I mentioned nor does my 23mm F2 WR or fuji 18-55 F2.8-4 etc.
So yeah some small differences but not so much to worry about now I've seen printed results.
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I have G.A.S, - gear avoidance syndrome.