That 4.7" is the sweet spot. That'll be my next iPhone.
I tend to agree. I was in a Best Buy the other day and found a 4.7" and a 5.5" phone that are least roughly comparable scale-wise to my iPhone 5. The 5.5" was just too darn big, and I have reasonably large hands. The 4.7" looked like the better compromise (and with a phone, everything is a compromise), being manageable but also sufficiently larger than the 4" screen on the i5 to be worth moving up to.
Put another way, the 4.7" still looked and felt like a phone; the 5.5" looked and felt more like a tablet.