Firstly, if you have the money to throw and enjoy spending money and feeling the gear in your hands, spend it. It's not all about photography here, people enjoy the act of photography as much as the result.
Technically a better camera will have better high ISO performance, assuming of course, you buy a matching better lens. The improvement technically in gear is one thing but the 80% contribution is your understanding and your skill and your persistence. You might have gear that is 50% better but gear is only 20% in total of the photo. You, the human contribute 80%.
Here is a higher resolution with the EXIF info this time. Sorry for the messup.
I just noticed that the pics were shot at 1600 ISO, pretty high I think. The way I have set my camera is ISO 200 but with auto ISO control "on" that goes up to 1600. The pics were taken around 5pm, so the ambient light was still good. No flash.
The 80% factor is you. You should not use Auto ISO. In the same way that the camera is a pro tool, in a pro's hands, for that shot, the camera would not be on Auto ISO. You have to figure out by practical tests what is too high an ISO to be acceptable to you. If you find an AUTO ISO in the new camera, the same thing will happen if you do not take control.
The ambient light may still be good but is it "good enough" for higher quality photos. A better quality photo will from better angled, texturing light. And purposeful selection of depth of field and sharpness balanced between avoiding motion blur vs choosing an f/no that will deliver.
Whichever camera, the human intervention makes a bigger difference..
I am using manual mode for more control over aperture and shutter speed.
Manual exposure mode does not control f/no and shutter speed any better in this instance. It is not a high dynamic range subject nor is it a strange lighting condition. Ps or
A or S with choice of EV Comp does the same.
--
Ananda
http://anandasim.blogspot.com
https://sites.google.com/site/asphotokb
'There are a whole range of greys and colours - from
the photographer who shoots everything in iA / green
AUTO to the one who shoots Manual Everything. There
is no right or wrong - there are just instances of
individuality and individual choice.'