acdsee full screen display resampling quality lacking?

Has anyone noticed that ACDSee (4.x, 5.x, 6.x)'s full screen display
(reduce to fit) resampling quality to be lower than that of ThumbsPlus
and Adobe Photoshop Album?

A few years ago I picked ACDSee to be my image viewing application
because at the time, it has the best image display quality when I use
full screen display and reduce to fit option. Other program I've tried
does not produce a smooth image as ACDSee does.

I had the opportunity to try Adobe Photoshop Album, and the current
version of ThumbsPlus, and to my surprise, I noticed the image
displayed by those two apps appears to be somewhat sharper, especially
on some images. The display quality of Photoshop Album seems to be the
same as ThumbsPlus, but ACDSee was noticeably softer in comparison.

One image I have, it was a huge scanned image, 4000x4000, in ACDSee,
there were a lot of rough edges that I can see, but on ThumbsPlus, the
image were reduced nicely and everything was very smooth and sharp. If
I shrink the image in using ACDSee to screen resolution, it is also
displayed smoothly.

I think ACDsee has not improved its resampling algorithm over the
years, at the time it was pretty good, but now comparing to other
applications, it's being to show its age...

If you haven't noticed this, I invite you to download ThumbsPlus or
Photoshop Album and try it out. It'll be an eye opener for you or
anyone who cares about image quality and has been using ACDSee for a
while.

Raymond