Ideal lens for shooting the Milky Way

The first time I visited the Church of the Good Shepherd, built in 1935, on the shores of Lake Tekapo in New Zealand, I was the only person there. That was 1981. Fast forward to 2018 and it is now a carnival atmosphere because there are so many people (at least, pre-Covid). And this wasn’t at sunrise or sunset -- it was at night. There is hardly any illumination on the church, and what’s interesting about this picture is the lighting comes from cars in the parking lot. During the 15 second exposure to capture the Milky Way, I also captured this now-famous New Zealand icon lit up inadvertently by all the visitors. The red color on the left of the church comes from the tail lights of a car, while the lighting on the right side originated from headlights. My lens aperture was f/1.8 because I used the Sigma 14mm super fast wide angle lens, and the ISO was 2000.