Now the Lumia 830 is the best Windows Phone you can buy considering price tag and features (considering features only the Lumia 1520 and 930 would be the best, of course). Here’s why:
First of all the things that the Lumia 730 does better than the 830: Screen. Price. Front facing camera. That’s it. It is cheaper, but not necessarily more valuable.
Although I do not really like AMOLED screens, the Lumia 730 has a really good one. It is clear and has a very high contrast, but the colors can be set to be either natural or shiny, depending on what you prefer. Because of the smaller screen the pixel density is higher and better than on the Lumia 830.
The front facing camera is really good and much better than what you will see on most other devices, however it – of course – cannot replace a real camera.
The Lumia 830 however has the much better main camera. Not only is it much faster but it also offers more features and a better picture quality. With Lumia Denim and a camera button the camera starts up within a second even when the phone was sleeping. The Lumia 730 however suffers from performance issues; it is no better than how it was before Denim, which promised to improve th camera speed on the older devices. After the camera icon was pressed it takes the camera about three seconds to open. Additionally it does not have a camera button, which means the phone needs to be unlocked first, then the action center needs to be accessed, the camera button pressed and then it takes another three seconds to get a shot. Way too long and no improvement over the Lumia Cyan update on old phones. Also Lumia rich capture is not available on the Lumia 730. In my honest opinion this is one of Microsoft’s killer features.
As can be easily seen the pictures are quite different. The picture of the flower without flash looks better taken with the Lumia 730. It looks brighter and also a bit clearer. The picture with flash turned on looks about the same. The last picture which was taken without flash in sunny environment looks a lot better taken with the Lumia 830, however. The contrast is higher and the picture less blurry. Now let’s get back to rich capture: While the 830’s no-flash picture looks worse than the 730’s and both are on par with flash on, with rich capture the flash can be adjusted afterwards, which makes the best result of all in my opinion. In other words: The Lumia 830 wins the flash discipline. (Except the last picture, besides flash adjustment all were taken with automatic settings. This should not be seen as a real camera comparison as it takes into account only a small amount of settings and options, but to get a quick overview it should be alright.)
Cortana is also very different on both. While available on each device (except in Germany; at least here the Lumia 730 does not have it yet) only the Lumia 830 has the “Ok Cortana” feature integrated. This is due to a low energy chip which is built in. It is always running and consumes almost no energy, but is used for features like “Ok Cortana” which run in the background even when the phone is locked.
Double checked: “Hey Cortana” really is not available on the Lumia 830. The thing that led to this misinformation was that it came preinstalled with the Lumia 830 trial device and since it does not work in Germany either way I did not bother checking it out – sorry for the trouble, guys!
The next argument is the design. Which phone looks better is up to everyone themselves, but the Lumia 830 certainly feels better in the hand. It feels a little bit heavier but thanks to the aluminum frame also much more solid and premium. Additionally it has the more efficient design. Whereas the Lumia 830 possesses thin bezels with every free space being used, the Lumia 730 has lots of space wasted. The top bezel is unnecessarily thick, just as the bottom one. Latter could have been used for capacitive navigation keys but the Lumia 730 has on screen buttons which not only make the (in my opinion already small) screen smaller but also the device unnecessary tall. Overall the Lumia 830 is bigger but it also has a bigger screen and a better size-screen-ratio.
All this does not mean the Lumia 730 is a bad phone! It is not, it is really a good phone. The point is: If you are struggling between the Lumia 730/735 and Lumia 830, in my opinion you should chose the latter. It is only 30 bucks more (on Amazon UK), and although it could perform a little better (it is on par with the 730 but since it is an 8xx device it could be a little faster) you get a better camera along with a more premium design and Qi wireless charging. If these features are not worth 50 bucks for you, you should get a 730 of course, but let me tell you: I am sure you will not regret the extra pounds.
You can find some more pictures of the Lumia 830, also in comparison with the 730 here: https://onedrive.live.com/redir?resid=3E893C5E45E14324!183464&authkey=!APornP1AAYFHlYM&ithint=folder%2c