Friends,
For sure the new cam is a better cam than the old one.
What I want to say is that the MP are not so important as you are saying, specialy if we talk about pics to be viewed at computers, via internet.
More important than the MP are the camera lenses - with a good range of F-stops and shutter speed.
You will only need a higher megapixel camera if you want to print the pics with quality. Thats the only reason to have a cam with higher resolution.
I believe that a camera with manual mode will allow much better pics than with the auto mode.
I use a Sony F717, with Carl Zeiss lenses, that has 5 MP. It is a very good camera and all of my pics are made with the manual mode. I can produce the amount of light that I like without making it after, with photoshop. And the more important of all, if you have the manual mode option, you can have the best depth of field at the image if you close the apperture - higher f-stop and compensate it with the lower speed as the situation needs, and for that you will need a tripoid or something to hold the camera.
I prefer a softer light than most of you, but this is a question of personal taste.
Anyway, with a good light you can use the higher F-stop possible,and that, as I said, allows a better DOF.
:cheers