New FF camera, but have some questions..

[loggie24]

Hi. I'm currently looking to upgrade from my meager Sony A58 (with default lens) to a full frame. I'm quite experienced with photogrammetry in it's entirety but haven't done too much research regarding cameras. I have a few questions..

1. How much does the amount of megapixels affect the final product.

2. Should i focus on getting a proper lens rather than the camera itself.

Current budget would be around 2000$ for both camera and lens..

I'm looking at a Sony A7 with a Sony Sonnar T* FE 35mm since it's around my price range.

Any tips would be greatly appreciated 

[stihl]

The Sony a7r MARK 1 is a great camera. High iso range, high resolution, many options and not a lot of chromatic abberation with the sony lenses. I'd recommend buying that.

[Arie]

The amount of megapixel determine how much details can be captured with a single shot. Of course you can get the same amount of detail with a lower resolution camera, but you would have to take more pictures while being closer to the object of interest.
Furthermore, with more megapixels (smaller pixel pitch), lens defects show more clearly- this means, better lens quality is needed for optimal utilization of the increased resolution. For example, unsharp corners might not show on a 10 mp sensor, while being clearly visible on a 36mp sensor.

In general, I would recommend to spend at least as much on the lenses as on the camera body. The value of the camera body decreases way more rapidly than lenses do.

The 35mm f2.8 is a lovely, tiny lens, which has a very good image quality. Also, what stihl said.
Cheers!