The Nokia Lumia 1520 is inevitably a large device, the 6" screen alone is huge for a pocketable device. That said, it's actually reasonably sized for what it is - it measures 162.8 x 85.4 x 8.7mm and weighs 209g. Put that next to the HTC One Max with a 5.9" screen, which stands at 164.5 x 82.5 x 10.3mm and weighs 217g, despite the 0.1" smaller screen.
The Lumia design has been pretty much set in stone though there are some variations. The Nokia Lumia 1520 is actually very similar to the Lumia 925. The difference to the Lumia 1020, for instance, is that the top and bottom edges are rounded rather than flat. Other than that, the rectangular look and beveled sides are unmistakable trait of the Lumia line since its inception.
Phablets are pushing the limits of what can be considered pocketable and comfortable for one-handed use. That said, the Lumia 1520 is not the biggest - as we said the HTC One Max is a tad taller and heavier, while the Samsung Galaxy Mega 6.3 is tangibly bigger.
Those have some software features to help with one-handed use tough, which mostly amount to squishing keyboards (i.e. the on-screen QWERTY and the dialer) in the corner so you can reach buttons with your thumb. Windows Phone lacks such options and the Lumia 1520's large screen will have some people limited to two-thumb typing.
The phablet maintains the capacitive Back, Home and Search buttons just like other phablets (One Max, Galaxy Note 3 and Galaxy Mega 6.3). Above the screen is a 1.2MP/720p front-facing camera along with an array of sensors. The front of the phablet is almost entirely covered with Gorilla Glass 2, which coats the screen, the capacitive keys and front camera.
The basic layout of the other hardware controls is unchanged - all buttons are on the right side, starting with the volume rocker on top, then the power key and finally the two stage shutter key. Those keys have been moved down so they are easy to reach with your thumb (though volume up is a bit of a stretch).
The left side of the Lumia 1520 holds the nanoSIM card and the microSD card slots. Those have to be opened with a dedicated tool, which might be a hindrance if you swap memory cards often. Still, we're always glad to see expandable storage, especially on devices with high resolution screens, high megapixels and monster chipsets.
The bottom of the phablet features a regular microUSB 2.0 port, while the 3.5mm audio jack is smack in the middle of the top side.
It's the back of the Nokia Lumia 1520 that's quite interesting. The 20MP PureView camera with ZEISS lens and optical image stabilization protrudes slightly from the back, but less so than the Lumia 1020's camera. Keep in mind that the 1520 is 1.7mm thinner than the 1020 too, using a smaller sensor has really helped Nokia keep that unsightly hump in check.
Aside from the sensor size - 1/2.5" vs. 1/1.5" - there has been another concession made, there is no xenon flash but a dual-LED light instead. Still, the sensor is relatively big (around 45% bigger than the common 1/3" sensors), which combined with OIS should still make for some great low-light shots.
The Nokia Lumia 1520 phablet has a whopping four microphones, a pair on the front and another two on the back. On the front, there's one below the screen and one near the earpiece. On the back, there's one above the LED and one inside the loudspeaker grille. The mics in each pair are sufficiently wide apart, so you can expect great stereo sound capture from both the back and the front camera. The mics also include Nokia's proprietary HDR tech and Bass filter option.
The battery in the Lumia 1520 is sealed, but it has the reasonably big capacity of 3,400mAh. The phablet comes with built-in wireless charging, something that was dropped from the 1020. We'll leave the proper battery test for the complete review, but official numbers promise a month of standby, over a full day of calls or just over 5 days of music playback.