The Metal Gear franchise is one of the most influential IPs in gaming history. You could say it's part of the reason why stealth games today are what they are. After 2015's Metal Gear Solid V: The Phantom Pain gave us a glimpse of what Metal Gear could do with the use of modern technology, it would've been amazing to see at least one installment for current-gen consoles.
However, as things stand, this is highly unlikely, which makes this graphics comparison sting.
In a Reddit post titled, "Solid snake comparison, we have come a long way.", a user did a comparison of what Metal Gear Solid looked like way back then to its latest title.
Just to clarify, the character models used in the image aren't all of Solid Snake. The left one is Solid Snake as depicted in the original Metal Gear Solid, which came out on the original PlayStation in 1998. The other one is an unused character model of Big Boss, who's known as Naked Snake, presumably from 2014's Metal Gear Solid V: Ground Zeroes. It's not Venom Snake either since it doesn't have the horns/shrapnel and the scar on the left eye.