It is great that you support Media comparison inside reviews.
However, we are a bit frustrated, that that does not include comment comparison. It is easy to imagine a situation where you have version 1 with improvement comments and the improved version 2, where we wish to compare the changes.
We also heard from a partner who also uses SyncSketch that they currently do such reviews in the same we as us ... basically opening to separate browser windows to follow the comments.
Instead of that we suggest that in compare mode you show comments from both Medias and just color code them in the same fashion you color code the selected video A and B as demoed in the attached demo screenshot.