Citigroup kicked off the first big week of earnings reports on a high note on Monday. The stock rallied 4 percent, pushing the rest of the financial sector higher along with it. Goldman Sachs, J.P. Morgan, Wells Fargo and Bank of America report later this week. Here's what experts are watching out for: · "We're not going to have the most beautiful bank numbers," says CNBC's Jim Cramer, "but people are expecting awful things from the banks, and when you get awful coming in … that's exactly...