Soft image in library content, Deinterlacing on progressive content?

I’ve noticed a bit of picture quality difference between Channels and Plex/Infuse with regards to progressive library content (ie not live tv). Generally, the image appears softer in comparison.

Is it possible that the content is being deinterlaced unnecessarily?

Thanks.

Maybe. Does changing the deinterlacer setting make any difference?

Didn’t seem to make much of a difference.