Like its predecessors this jump is not as big a jump as you might think (but remember, Sony releases on a 6 month schedule versus others who wait a full year). So what does it include this time 'round?
Here's the comparison:
|Xperia Z3||Xperia Z4|
|Processor||2.5GHz x4||2GHz x8 (64bit)|
|Type||Snapdragon 801||Snapdragon 810|
|Released||Sept 2014||Apr 2015|
Not a lot of difference here, it's the same G Lens as before for the back camera (1/2.3" up to ISO12800) and they've bumped the front camera to 5MP.
The processor looks to be a decrease, but it's the new Snapdragon 810 with 8 cores and only 64bit.
The only question I have is that they've reduced the battery size ... only about 5%, but still. I'm assuming it's to make way for the slightly smaller chassis than the Z3.
Speaking of decrease... maybe it's just the translation, but their website shows the price will be 7,000¥. Which would be under $100CAD, I'm assuming that's for the subsidized price.
Just I think this is a bad move on Sony's part to be 'quiet'. In a time where rumours persist that Sony's fracturing itself left, right and centre an almost missed announcement for Japan only doesn't do much for us folks on this side of the ocean who want to see them continue to improve and grow.
Source: http://www.xperiablog.net/2015/04/20/sony-xperia-z4-announced-in-japan/ via http://www.sonymobile.co.jp/company/press/entry/2015/0420_1_xperia_z4.html