In your opinion, what level should a high-performing PHD with 5 YOE be at? I know Google hires fresh PHDs at L4, and this post suggests 5YOE --> L5 in most cases. Agree? How about Microsoft, Amazon, etc? https://www.quora.com/What-level-of-Software-Engineer-should-a-PhD-+-5-years-experience-negotiate-with-Google-for-What-level-should-he-get-when-being-accepted-via-interviews-and-joining-Google-And-what-is-the-salary-expectation-He-is-in-the-UK
What range would you expect for 5 @Google vs 5 @other tech org?
hmm not sure I understand your question. if you have 5 yoe from any big tech (fb, ms, amazon, etc) + a phd, then you most probably would get L5 at g. but if it's 5 yoe at a no-name tech company, it probably wouldn't move the needle too much. keep in mind that every individual situation is different.
it depends on which company you did have the 5 yoe.