Seriously? I think i have the same problem. Everytime i upload a picture to a website (instagram, twitter, or google plus) the pictures come out pixelated pretty bad.
They look nice when im on my stock camera gallery but once i upload it turns into crap. At least not as good when you see it on the gallery.
I dont remember the phone doing that on 4.2.2.
Same happens when i use the instagram camera software or twitter camera.
LG G2 on 4.4. Kit-Kat <3