iPhone is a clear leader only as a single phone model. Just like with sales numbers, while iPhone outsells any given Samsung phone,
That's the point. That's why the iPhone and Apple's business model is so impressive. Where are the iPhone killers? All you need is ONE phone, done right. There aren't any. Cant they make a single, premiere phone that stands apart? No. Because the competition simply doesn't know how to make one. The only way to compete its to flood the market and bank on quantity and sheer force of numbers by slamming a universally-licesned OS into the 60-odd boxes they sell.
Not impressive.
all Samsung phones combined trash iPhone easily.
Yes. How is that even remotely impressive? Throw Muhammad Ali into the ring with 30 other guys and he'll go down pretty quick. Sheer force of numbers, even when it's all ****, can nullify any single contender, no matter how good that contender is. Of course, the real victim in such a misadventure is quality, User Experience, and device shelf-life.
Then of course there is an issue whether all iPhones should even be lumped together. There are 3GS, 4 and 4S, black and white (different thickness), 16Gb, 32 GB and 64GB, Verizon and AT&T (and they are different - at least in case of iPhone 4).
Samsung's phones have been lumped together in order to reflect "world's top smartphone manufacturer", ranging from the good, down to the absolute junk/low-end that is priced accordingly.