That's what they told me as well. That the 19th is only tentative not firm. I keep checking and hoping though lol. What I also like is that, from everything I've read, we don't have to choose between the two different backs. Since only the 2 are coming to Canada the phones will be shipped with both the leather and plastic back.
I don't know about battery life as the reviews just seem so inconsistent on this and every other phone regarding that but in terms of performance, every G4 review I've read said that the phone was buttery smooth compared to the S6 and that despite the brute force approach by samsung that their touchwiz UI still provided a more jumpy experience than the G4
On that particular metric almost every review seems fairly consistent in it's praise
Your own comment then applies to all phones and those who review particular devices including Samsung.
I can serioulsy state though, that the G4 has been reviewed in a much more favorable light than the S6 on the majority of sites. It even won out over the M9 in many cases. The M9 has disappointed many it seems. I have had the M7 and M8. I've also had the G2 and G3. I've had the Samsung S2 and S3 and two of their 10.5 tabs and their Note 2. The Samsung Galaxy S 10.5 tab I like a lot and am impressed with. The phones have been literally nightmarish. I'll never fork out that kind of money for a Samsung phone again. Tab yes.
The M7 was a good phone I liked it a lot. The M8 was also pretty awesome and I like the BoomSound just as much or better than Beats. Music is awesome on the HTC's. But for a daily phone...LG wins out every time. Even the sound on the G3 is way better than the G2. They also made organising ones music much less complicated.
These phones are like pieces of art. They are, to a point, subjective and therefore a personal preference. There are also facts and specs about the devices which will sway some and not others depending on what one is looking for in a device.
Regardless, seeing as just a couple of decades ago we were carrying massive devices with gigatic antennas around in our cars, what we have available to us and the choices is incredibly impressive.
Now just let us preorder it, lol