I just got the 73742, and while shopping for it, was told by the salesman at Paul's that the biggest advantage of the 842 over the 742 is the built in sound bar. He told me this even though he was sold out of the 742's, but did have 842's to sell. I think the biggest defect in all of these sets, which was also a problem on my 2009 mits, is that there is an internal reflection in the tv, which may cause halo's or similar bright reflections with some content. My 742 still suffers slightly from this, although not near as bad as my 73C9, which also got better over time. Good luck in your decision.