Since they don’t have China Eastern on Seat Guru, take a look at the Cathay Pacific 340-600 seat configuration- it should be pretty similar.
As for TV’s, the CP planes offer them, so I’d wager on a “yes.”
Service? Never flown on it.
Route they fly? Do a search for the flight number you’re taking and see what they’ve historically been flying. The route will depend on the weather (and other traffic, especially when going over the ocean), but if you look at the same day of the week as you plan on flying it should be pretty similiar, traffic-wise.
Hope this helps!