a significant improvement
"...The X's 1125x2436 panel is a significant improvement then...."
No it isn't.
"...2014's iPhone 6 Plus, used a 1242x2208 panel..."
Even "downscaled to 1080x1920" it's isn't "significant".
QHD is more significant than this yet another non standard aspect ratio and non-standard resolution.
1000 bucks.... not in a 1000 years!
Biting the hand that feeds IT
