Nah, I've actually been looking at the 1.8 seriously.The a7riii is definitely a beast, being able to crop in 50% into the photo and still getting ridiculous resolution .
You're probably looking at the 85 f1.4, if you haven't already check out some comparisons between that and the 1.8. Most say the difference between the two don't justify getting the 1.4, especially since these are beast in terms of iso and noise.
I know exactly what you mean about the difference not being justifiable.
The price difference is like $1,000 too. I'll be fine using the standard Sony lens for the 85mm instead of the G master version.
I went with the G Master version for the 16 - 35 mm because I wanted a constant 2.8 throughout the focal range. I think the regular model is like 3.4 or something like that.