I just wish it had a 1080p display. At that size, the images won't be as crisp. I don't think it's a make or break deal, but still... 1080P, and I would have thrown more money at it! Let's see what the flagship device is
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I had a Lumia 1520 (1080p) and replaced it with a 640 XL (720p). I don't see why my phone needs to have the same resolution as my TV set.
I rarely benefited from the higher resolution of the 1520, but I benefit daily from the better battery life of the 640 XL (in part aided by it not being quite as powerful as the 1520).
Ain't the phone too big to handle??
Depends on your hands, I suppose. I find it a good size. 5" phones feel too small in my hands.
730 : small and comfortable in your hand, easy in easy out of your pocket
670 XL : satisfied viewing content on big screen
that's all the difference
I don't understand why people make definitive statements about whether a phone is a good size for everyone or not. Everyone is different. I'm tall (6'1") and broad shouldered (48cm wide). I mostly wear loose-fit mountain-style cycling shorts that have big, deep pockets. Tiny phones like the Lumia 730 just bounce around in there and feel awkward, whereas the Lumia 640 XL is a very good size for them as it's braced in there a little better (but is still dead easy to get in and out of my pocket). I have long fingers and they cramp on anything smaller than a 640 XL (the Lumia 1520 is an even better size for me, but I prefer the better frequency support, better battery life, and dual-SIM nature of the 640 XL dual-SIM LTE).
And there are other differences of course too. Much better frequency support for the 640 XL in many variants being one of them.