... because of sensor reflections. A7 at the left, A7R2 is right. The A7 produces blobs and streaks near very strong highlights as is well documented already. When seeing this earlier I decided to rent an A7R2 to see if it did any better in comparison to the A7. And it did. After thinking 1 minute about other full-frame options I decided to stick with Sony and that left me with three options, each € 1800 apart: stick with the A7, buy an A7II or buy an A7R2. Sticking with the A7 for night photography is out, I don't want to come home with suboptimal results when I put in a lot of time and effort to make those shots. After a lot of agonizing I decided to splurge for the A7R2 because I liked it. Lesson: don't rent a camera you can't afford to buy .