The 950 divides the page up into thirds when put in landscape mode, so apparently an A4 page can be read with almost the same font size when viewed in landscape on the 950, but divided up into thirds. I image when reading articles that have a column format the extra inch might make for more pleasant reading in portrait view as well. Here is a video review of the 950's PDF viewing capabilities, if you want to have a look.
http://www.youtube.com/watch?v=6sYTLtYPh90