Eh I wouldn't really say it's unfair. The 1/4 version is better than the 1/6 overall. There's no need to pull out a ruler from a desk or run some experiments to see which one has what paint. It's a bigger scale and it gives them the breathing room to make it more "accurate".
Heck I have the 1/6 version displayed right now in my detolf. The 1/6 version is a great figure but seeing the exact same suit done with the precision that people wanted done on the 1/6, leaves people wanting that on the smaller scale version. If Hot Toys did a 2.0 1/6 version taking what they did on the 1/4, people would be all over it, myself included.
The 1/4 version just looks like a 1/1 on almost every shot. The 1/6 version doesn't in comparison.
The exact same things being said in this thread was said for the 1/4 TDK Batman figure. Better cowl? Check. Better shoulder armor plating? Check. Better likeness in the eye sculpt? Check. More accurate overall? Check.
The 1/6 version is slimmer overall. Helmet is better on the 1/4, torso is slimmer in diameter on the 1/6, thigh area is slimmer and the shoulder armor alignment also reaches outward away from the body more on the 1/6 when in neutral pose due to the construction of the shoulder plating joint. Even the faceplate has the correct eye slit size on the 1/4 version.
I'm going to be owning both and I see no problem with people pointing out the difference because it's only natural for it to be said. They're the same suit done in two different scale with them both looking very distinct from one another. But with the 1/4 being finished better it leaves people to say that it is. A lot of these shots for the 1/4 version look like they're pulled straight out from the movie or photographed on a 1/1 suit.
Nobody is downplaying the 1/6. It's just pale when compared between the two. I'm pretty sure most members here have the 1/6.