How is this even off-topic?
If I have to guess: OP's question was answered a month ago. Comparing image quality on third-party sites doesn't belong in Meta.
I didn't expect the rule to be so stringent though. After all, it happens ever now and then as conversations tend to slightly deviate from the OP when there are further questions to be asked.
As long as it doesn't involve necroposting or participating with the same replies, I feel that it should be permissible.
Otherwise every thread would be pretty boring with just a solid answer and other inputs get removed.