Should i go for a combo or just one Pro DSLR?

Should i go for a combo the nikon D800 and a D4 or a Canon Eos 1Dx i don't have any lens from nether i will get a loan to start a photography business and shoot wedding and sports.

Added (1). I have a Sony i want to upgrade to a Nikon or Canon i use to shoot for a news paper company i no longer do that, so can some one help me decide i don't know which to get…

Added (2). Then what's the best combo for the 1dx?

Eagle SMart's got the point

I'd stick with the Sony and look at other lenses.

There's little a Canon or Nikon can do that your existing camera can't - so learn to use it properly.

Since you have to ask, you don't need any of those camera.

Brilliant - so you know absolutely nothing about photography, but you think if you go out and buy nice gear you'll magically be able to produce pictures that are worth selling?

This is like a 14yo saying "I want to be a race car driver, should Mommy & Daddy buy me a Corvette & a Mustang or a Viper?

-You're not ready to shoot wedding (unless you shoot alongside a pro).

I'd say go for the D800 and D4 combo. Remember you are capturing someone's most memorable day and imagine if your camera broke. How would you explain that to any bride. The D4 and D800 combo is an excellant combo and you don't lose much quality if you need to use the D800 if your D4 is not working. If you go for the 1DX you would still need a backup and due to the price of the 1DX i'm assuming your not going to buy a pro camera as your backup like what you would do with the D4. You would have lackluster images with your backup compared to your 1DX.

If wedding is you goal, you need no real high end camera, you will anyway never print anything bigger than A4. Use a camera that takes very well low and high light since white is the wedding treat. Nikon d700 and Fuji S5 bodies are here the best you can find. Buy both used and use the same lenses for both. A good 12-24/4 Tokina, an 18-35/2.8 Nikkor, a 30 mm Sigma 1.4 in DX only for the S5, 24-70, 2.8 for the FF Nikon and a good 70-200 zoom for distance shots and faces on the stairs, 35-1.8 range for Portrait, you can use the FF lenses on both, and 2 tripods of good quality. And you are done. Shoot the procession with 2 cameras at same time and in multi-exposure bracketing.

If i had the money for those kind of cameras i would go with Canon 1D x it is in my opinion better than D4 (faster, better ISO a bit more of MP, ) the D800 just has a great amount of details but it is not fast, the FPS is low and much lower than 1DX, the auto-focus is good but worse than 1D x a, the metering is awesome but 1dx is better 100.000 vs 91.000 RGB metering sensor the ISO is worse.

many people are saying to chose D4 and D800E, i think 1D X and D800E, the D800E would be a great replacement for much much more expensive medium format cameras, check the DoxMark score of the D800E it rivals Phase One iq180, so 1D X and D800E and i would chose E version so that maximum sharpens is ensured