The Sony Xperia Z Ultra has a smaller 3050mAh battery capable of up to 16 hours talk time, the HTC One Max has a 3300mAh battery which should be able to manage a Lumia 1520 matching 25 hours of calls and the Samsung Galaxy Note 3 has a 3200mAh battery with a talk time of up to 21 hours.
So the Nokia Lumia 1520 has the biggest battery and in theory it and the HTC One Max are tied for best battery life. The only other thing to be aware of is that while the Samsung Galaxy Note 3 has a removable battery the other phones don't.
Above and beyond specs each of these phones has a few unique selling points. The HTC One Max for example has dual front facing BoomSound stereo speakers, delivering great audio quality. It also has a fingerprint scanner and HTC's divisive BlinkFeed, which combines all of your favourite news feeds and social network activity into a screen filling feed.
The Nokia Lumia 1520 has an app called 'Storyteller', which uses your pictures to tell a chronological story, showing you where you were and when by integrating location data.
The Sony Xperia Z Ultra is water and dust proof (just as long as you've got the ports covered) and the Samsung Galaxy Note 3 has eye tracking features, which can cause the phone to pause videos when you look away and keep the screen on when you're reading it.
Not to mention the S Pen stylus, which can make it easier to operate its large display.
The Nokia Lumia 1520 doesn't have a UK price yet, but its US price of $749 translates to around £460, which isn't unreasonable for a top end phone.
The HTC One Max is rather more expensive at around £600 SIM free, while the Sony Xperia Z Ultra goes for upwards of £500 and the Samsung Galaxy Note 3 will set you back at least £550 SIM free.
What can we conclude? Well the Nokia Lumia 1520 looks set to have the best camera and the lowest price tag of the four as well as sporting good battery life.
The HTC One Max is both the most expensive and least powerful, though it has a high quality metal build.
The Samsung Galaxy Note 3 looks to be the most powerful but it has the smallest screen and the Sony Xperia Z Ultra has the biggest screen of the four at 6.4 inches.
- Want more Nokia action? Check out our reaction to the Nokia Lumia 1520.
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James is a freelance phones, tablets and wearables writer and sub-editor at TechRadar. He has a love for everything ‘smart’, from watches to lights, and can often be found arguing with AI assistants or drowning in the latest apps. James also contributes to 3G.co.uk, 4G.co.uk and 5G.co.uk and has written for T3, Digital Camera World, Clarity Media and others, with work on the web, in print and on TV.