well, i migrated from android phones to iphone and as any other such person will confirm it, after using android phones for enough time, iphones feel as heavy as a brick. And yes my hand gets a bit strained after holding it in one hand for a long time while lying in bed..Hopefully, with increase in size and reduction in width, it would feel lighter(even if the weight remains same as now)
i guess i never noticed the weight as its not heavy to me at all. I like a little weight it feels more solid then something that is too light.