I already asked you a few weeks ago why you weren't buying HTC phones, opting for Samsung instead. We got many different answers, such as the SIII supporting SD cards, no removable battery for HTC phones, worse community support for HTC devices, and many more. The Galaxy S4 will most likely continue the trend, so what do the reviews say?
Well, first of all, every review mentions the use of plastic, something Samsung insists on doing. Whereas other manufacturers have moved to metal - like Apple or HTC - or higher-quality plastic - like Nokia. Engadget calls the S4's plastic "sturdy", but other phones have a more premium feel. If the plastic is indeed the same as that of the SIII, I agree wholeheartedly.
The Verge is even more direct. "I don't like holding this phone, and I can't overstate how much that informs the experience of using it. It makes an awful first impression, slippery and slimy and simply unpleasant in your hand," writes David Pierce, "Everyone I showed the GS4 to frowned and wrinkled their nose as if it smelled bad, before rubbing their fingers on the back of the phone and then handing it back to me — that's the opposite of the standard reaction to HTC’s One, which everyone wants to ogle and hold."
Moving on to software, the device is so packed with features it all becomes a bit unwieldily - so much so that Samsung even had to add an easy mode to the phone to remove most of the feature bloat. Engadget calls most of the feature bloat "party tricks" added for their "wow factor". ABC News calls them "gimmicks". As you'd expect, there's a lot of crapware on this thing, with no way to remove it.
Making matters worse - the bootloader is locked, so no custom ROM for you. If you want CyanogenMod or some other stock-ish ROM, you'll have to wait until the community does its thing and cracks Samsung's utterly pointless, stupid, and insipid locked bootloader.
There's also a lot of good stuff to report - the display is amazing, and thanks to clever engineering, the S4's 5" screen does not make the device any larger than its predecessor. The S4 is also incredibly fast, and you'll not be left wanting for more oomph. Then again, I never had much of an issue with CyanogenMod on my SII, but I guess all the bloat running in the background sucks quite a lot of processor power.
Battery-wise, it's supposedly a little better than the HTC One and iPhone 5, but since i'm used to my HTC 8X - which will easily last three days without a charge for me - I find it all pretty terrible. This is still one of the major downsides to any modern smartphone, and instead of adding pointless crap software no one wants, it'd be nice if Samsung or HTC spent some time on this issue.
Overall, the S4 looks like simply a decent successor to the SII, and it'll most likely sell like crazy and completely crush the - in my view - better HTC One. Be sure to tead the linked reviews fully to get a complete picture.