Don't see too many similarities. Reggie was a good QB and mostly played up to his potential, but just wasn't great or consistent enough to lead us where we wanted to be -- a top tier program. Simply put, he was a good but not great QB playing during a time when Tech managed to put great talent on the rest of the field. That 2006 team had enough talent outside of QB to compete for a national title, and instead we ended up with five losses
Jeff Sims has not been a good QB but has flashed a ton of raw potential which he hasn't played up to. The talent around him has been iffy at best outside of the RB room, and the coaching has certainly done him no favors, both for his individual development and the overall situation on the field.
I think most of us still struggle to know exactly what we have in Sims, whereas everyone was pretty clear on what we had in Reggie.