Says the person who joined MR very recently and appears to detest Apple in nearly every post. Did you know what this place was before you joined, or is it just the enjoyment of stirring things up? At least the discussion in the alternatives section has people who have owned both or currently own both operating systems so much of the discussion is balanced to some degree. You appear to just be anti in most of the discussions I have seen and I really don't get why somebody would join just to be like that.
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Back to topic. I did a quick compare with my mates wife's GS5 last night. Nothing too comprehensive just loading web pages, apps and general navigation around menus and I have to say my iP6 didn't suffer in the way the OP experienced. In fact my phone was ever so slightly quicker at some of the things, so perhaps it's unusual, or a defective iPhone/software glitch with the OP? It seems strange it was on two iPhones though. I'm sure we'll find out as the weeks go on and we have more users with hands on experience. I don't doubt there are teething problems as the is on many new release phones