Ok so I had to go out and give it a go. This was just with my standard Sony Full Frame E-Mount FE 70-200mm F4 G OSS to go with the Sony α7R so no wide angle but I think it did quite nicely! I did drive around to Wallis Creek to see what I could do there but the wide angle lens really is a must for that shot. I have definitely not given up on getting a Milky Way and a reflection on a body of water.
So this was from Barry Park, Fingal Bay. It's a little grainy so I'll have to work on balancing ISO and exposure time I think but I'll get the hang of it. I love the way it looks like Fingal Lighthouse is lighting up the sky!