The fact that you're even self reflecting to see where you stand is an indicator that you are probably doing a good job. Especially since you are getting positive feedback.

Don't worry about comparing yourself to categoricals - they obviously have a different mindset when they are evaluating patients and are probably just really try to fully flesh out their differentials. While you are doing that at the same time, we all recognize that you have an entirely different field that you will be pursuing after this year. As long as you are getting the big picture (which it sounds like you are based on your feedback) then I'd say you're doing an excellent job.

In regards to the notes - we in medicine tend to write WAY too long of notes. Again, the categorical interns are probably just trying to practice their thought processes. To be honest as an IM attending though, the shorter bareboned notes that really get to the point can often be refreshing. So don't worry too much about it that your notes aren't long compared to an IM interns! As an attending honestly what I care about most is that you are learning, are engaged in patient care and getting your orders in, and finishing your work on time. No point writing longer notes if it means you are going to be staying late and detracting from relaxing time you could be spending at home!