Do not bet on this. Zoro's purpose is to always be above Luffy so he is >PK level.
I am surprised that after everything that happened people dont see Zoro above Luffy...
Recency bias, I guess...
Are we reading the same manga? Zoros goal is to become WGS and Luffys goal is to be PK.
Mihawk, WGS for the past 10 years (give or take) stated that the path to become PK is tougher than surpassing WSS. He also wanted to test his strength against WB, the PK without the official crown.
There are no two ways about it PK -> WGS (unless the same person is both).
No need to feel bad, the WGS is amongst the 5-10 strongest in a world with thousands of islands and millions of people if not billions. And this comes from someone who has Zoro and Mihawk as two of his favorite characters.