You should, and the link above has more discussion.
Sounds like you got buyers remorse when you didn't see a HUGE difference in picture quality, vs your brothers, now, much less expensive pj. Double the price doesn't mean double the picture quality, that would mean we should get a 4k pj in my mind, but we won't see that for a while.
You paid for a newer pj, that has some nice advantages over a very good pj in it's own right, the 8350. Creative frame interpolation, better blacks, brighter image, longer lamp life?, and 3D capability. Some would say the 3D feature would be worth the price. Sorry those improvements didn't seem warrant the price difference in your opinion, but you can sell the 5010 for a slight loss, and buy an older 8350 and pocket the difference.