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The focal length itself won’t really help the stars to be more visible – but it will help you get a larger field of view and therefore can get a bigger piece of the sky in the frame while still showing some earth. Really wide lenses tend to distort the way OP’s photo is – with some dramatic effect – for better or worse.
Getting good images with stars will primarily depend on getting the right exposure – probably a very long exposure and a good stable camera setup (tripod). The other settings are for you to play with. I’ve had best results with medium ISO, medium aperture, and long exposure. I’ve had to do manual focusing and can’t always even use the viewfinder to focus, but had to do a long shot, wait, then review the focus on the LCD in the dark, ruin my night vision, adjust, repeat. It takes patience and a zen like attitude doing these kinds of photos, but I love it. It’s a lot more zen than the action-oriented, fast moving, rapid fire shooting.
Definitely try it with your 24-70. Start with something like ISO 800, 30s exposure, f/2.8-3.5. If you can do longer than 30s, try that with a lower ISO.