The Medical group has plenty of great stocks, but investors should always be looking for companies that are outperforming their peers. Has Roche Holding AG (RHHBY) been one of those stocks this year? By taking a look at the stock's year-to-date performance in comparison to its Medical peers, we might be able to answer that question.Roche Holding AG is one of 1000 companies in the Medical group. The Medical group currently sits at #2 within the Zacks Sector Rank. The Zacks Sector Rank includes 16 different g ...