Most production systems are barely on JDK 8. G1GC is the most used GC for high-performance production systems at many large companies (1B+ USD revenue) I have worked for.
I highly recommend trying out Java 11. G1 got quite a few improvements since 8.
Thanks, trying out is not an option for so many things. It is up to vendors to decide which JVM to recommend and I cannot overrule them. As of personal use, I am on 11.