Sure, it's not iPhones number, which are around 8 to 9 times higher but Samsung has to compete in a huge Android ecosystem, whereas the iOS one has only one offering series per year.
The Galaxy S has always been a very solid product line.
I think with Apple's software optimization, it'll be a really solid device. The only thing I'd be missing are the Pro level cameras.
But the reviews seem to suggest the front screen is actually very usable, and you get back some of the old smartphone one hand reachability, and the inner screen looks very versatile for media and side by side apps.