Yes, I've seen many comments to that effect, and the lure of better fidelity is a factor in my thinking. Yet I've also read posts from users who've compared the two players' audio quality side-by-side, and those folks report they couldn't tell them apart. I suspect there is little difference between them, at least in terms of sound quality. However, the difference in battery life is real, and it's not trivial.
I think that's kind of unfair though brand that those who say it's "better fidelity" is a "lure". I've not owned a HDP-R10 but I've listened to them as the stores. As such I can't comment on their battery life being longer as being "real". Therefore to be fair, for those who haven't experienced the HDP-R10, the battery longevity is just as much as hearsay as it is about the SQ.