excuse the subject (they're my gfs):

what would cause this kind of image quality on the right? everything has like a white tinge/haze

-optics look clear
-aperture snaps back quickly, doesn't get stuck and blades look fine
-both have the same design, just right has SMC coating
-both at 200mm focal length f5.6 aperture iso 12800, left has 1/50 shutter speed right has 1/60 shutter speed. pentax kf used as body
-both sooc jpegs, editing doesn't help the right image

left is this lens i just bought (cost $25 off buyee)

https://www.pentaxforums.com/lensreviews/Pentax-F-70-200mm-F4-5.6-Zoom-Lens.html

right is this (cost $12 off buyee)

https://www.pentaxforums.com/lensreviews/SMC-Pentax-FA-70-200mm-F4-5.6-Power-Zoom-Lens.html

i actually bought left after getting right and noticing it was the only lens i owned like that