I really like this image and I appreciate how you’re experimenting with different cameras.
However, the image isn’t overexposed. I think your concern has to do with drawing out some of the details in the sky and mountains which could have been achieved with a slightly darker exposure. However, this may have underexposed your foreground. One option for you to consider is using a grey-grad filter. Using a grey grad filter will help you properly expose for your foreground while drawing out more detail in the sky and the mountain range. A grey grad filter is a very inexpensive filter to buy and it’s great for use in landscape work. It’s generally clear on 1 half and uses a slightly dark gradient on the other half to kick the exposure down a couple of stops in your sky.
Other than that, I think this is an amazing photograph. In fact, it’s breathtaking. I enjoy seeing your experiment with design elements such as leading lines, lines in your mountains, curves, color palette limitation within a large geographic space and balance.
You’ve tied everything together very nicely in this image. Great work!