You have to describe what you mean with something seems off I mean IPS still is superior and has the best image quality in monitors for now on PC'ssomething seems off - maybe thats normal and i am just not used to stuff looking as "ugly" as this or its the monitor - or i was not really thinking when buying a tn panel cuz thats normal.
The Viewsonic is a little bit better just that the Viewsonic does not have backlight strobing. So I am recommending the Viewsonic mostly, and the LG when someone really wants backlight strobing. The Asus is clearly the worst of all I have tested. I do not own the LG anymore but I am really wondering what you say that your old Samsung has a better look - but since you have said that the monitor looks better now after adding color vibrancy I am somehow assuming that the Samsung has off-color saturation settings. The more color vibrancy you add, the worse your color dynamic range will be but colors of course then are more intensethis is popular monitor and lot of people buy it because your review (i read on other forums).
And u said that this monitor have best colors and picture quality? Than i feel sorry for Samsung, Asus, Benq, etc.
If you still have this monitor can you look at it one more time?