KDS's AV-195TF is definitely not "lower-end". It's the same tube as the G series. Even the tube's behavior is the same. I noticed that with Viewsonic and Mitsubishi AG monitors when you tap the sides, you can see the wires much more clearly than with the Sony trinitron tubes. Sometimes you can see vertical lines caused by the wires getting too close to the screen and causing a shadow. The Sony's don't really do that. (BTW, I'm not talking about the horizontal damper wires here)
Well, the KDS is identical to the Sony in that sense, tapping the sides don't reveal any wires at all.
You might as well get the KDS AV-21TF for the same price as the Sony F400, and you'd end up saving $$ at the same time. Or, get two AV-195TF monitors (19" for the same price as one F400.
The benefit of the F400 is the .22 Aperture Grille Pitch, but you're really splitting hairs there. Ask yourself if it's worth a grand for a 19" monitor...
There will always be the Sony advocates here, but after trying three Sony G500s and then jumping ship to the KDS, I am not disappointed at all.
Don't be fooled by the price; the KDS monitors are very well made and well supported. If you get a F400 and it breaks down or causes problems, GOOD LUCK getting a quality repair on it.