Just to add...
I noticed that when set to 1080i over DVI to my Samsung DLP, the picture on my 2910 was a little jerky, with interlacing issues or something. I have it to 720p, and the picture equals, maybe even betters, my tweaked HTPC and upconverting software.
Yes, calibration is a must. If the 1920 is like the 2910, there are a lot of settings within the player itself as well. At the very least you need to get the black level setting correct, and set the Brightness/black level control on your TV to match the output of the player.
As far as seeing black bars or not, that's an overscan issue. At least on my TV, my DVI input seems to have less overscan than my component input and the TV upconverting by itself (you see more of the image with less overscan).
Also, turn off DNIe (maybe not an option with the newer models), DNR (noise reductin filter), and other picture adjustments. With factory-set service menu levels, try the Warm 1 color temperature setting as well. Try about Contrast (white level) = 90, Brightness (black level) = 50 (or whatever you get when adjusting for black - easiest is to use the black letterbox bars on DVDs and adjust Brightness to just below where the bars go from slight noise/light to pure black w/ no noise), Sharpness under 20, and Color between 45 and 55.
If you can get Avia, that will really help dial in the settings.