I just did the JFK-ICN flight in Y two weeks ago, had a two hour connection which was not a problem...not sure I would like a 45 minute connection, but it is probably doable.

This was my first trip to Asia, so I have nothing else to compare it to, but the entertainment system in Y seemed quite good to me. 10.5" screen with probably 40-50 movies on demand, plus shorter videos, lots of music, flight map, games, etc. As far as seating, my wife and I were on our honeymoon, so we wanted a two seater as well, and they do exist in the very back of Y, rows 52 & 53 are 2-3-2 while the rest of the cabin is 3-3-3. Of course with your tight connection, you may not want to be sitting in the tail end of the plane. Hope this helps.