I unfortunately notice no such differences on different monitors. (I loathed our widescreen which came with this computer...I just can't stand widescreen. It mangled my photos and the text was always too big or too small no matter how I adjusted it. Had to switch back to the regular monitor. Unfortunately, almost everything seems widescreen nowadays.

) Reading is as difficult on one monitor as on another. (I have trouble focusing, not seeing.)
The only thing I can say with certainty is it's easier to focus on words on a page rather than on a monitor but I think this has more to do with simple ease of reading and being able to carry it around to quieter locations. I can't rightly print out all my stuff though, especially unproofed pages, there's so much of it!
Oh yes. Some fonts make it more difficult to focus than others. I can't stand Courier New. I just can't read that. I change things to Verdana most of the time, or Times New Roman.
But aside from that my writing looks like my writing anywhere I'm looking at it, and it always looks the same to me. :/