Is a 1/2.3 sensor to small for a quality bridge camera?

eg

https://www.techradar.com/uk/reviews/cameras-and-camcorders/cameras/compact-cameras/sony-hx400v-1221175/review

Read more: Is a 1/2.3 sensor to small for a quality bridge camera?

Why are the photos on my Nikon D70 so noisy?

As I've become a little better photographer and I've gotten to know some of the photographic terms, I've noticed that the pictures I take on my Nikon D70 are very unsharp and extremely noisy. From first glance, they look fine and very sharp, but upon zooming in, you can tell there's a lot of unwanted noise. (Examples on my Flickr @ flickr.com/carrickwebb.) Is there any way I can improve upon this and take better photos with this camera, or is this the quality I'm going to be getting with it no matter what?

Read more: Why are the photos on my Nikon D70 so noisy?