Err..., I will answer Job's question, but right now i need some sleep now. will edit this post tomorrow~~~
And Error, Yes, there are differences, but still like an ipod sort.
Ok, first we take a look at the circuit board of M3(From Chinese site, so please wait patiently for loading)
This is the picture posted by J.Wong, who commentted:" Look at these thickly dotted components/Ics, then you know how difficult it is to reduce its size while ensure good performance." And this comment is based on the standard version, not the shorter one. So reduce 3mm more is not a little case for them. They need cram a big screen, an enormous battery which ensure 20 hours playback, and the heart of the device, circuit board, and moreover, this device need to be able to play music, Fm tuner, Picture viewer...
Acctually, Job, you may creat a document in your Photoshop or similar software as the same length and width as M3, then you have a direct image of how small it is, don't forget, it has a screen.
And from the optical point of view, the tiny the thing is, the big differences can be noticed even only several mm's change.
The last news i come acrossed this morning is that Meizu will adjust the prices of battery charger, battery case and silicon case in China respectively from RMB68(Recharger and battery case kit), RMB38to RMB49(Recharger and battery case kit), RMB19, but when they will execute the new price and whether will be carried out in foreign markets is unsure yet.
And they also plan to rise the charger's electric current from 0.8A to 1.0A which was said "make preparation for M8".