You can do this in MP3tag by clicking on the column header.
If you are not satisfied with the result, you can set a format string including scripting functions to get the sort criteria.
Yes, admittedly, finding duplicates by tag data is not possible with MP3tag - see also this discussion on the drawbacks when using just the tag data to find alleged duplicates:
I doubt that there are duplicates in a folder or at least they have to different in respect to the filename.
So get these, you may apply an action to set the filename with a unifying pattern and see where this fails as it would rename to several files with the same name.
You could then treat these files straightaway in MP3tag.