OK, here is the comparison of max cruise speed.
SR22: 185 knots
DA40: 142 knots at 6,000 feet
Cessna 400: 179 knots at 65% power, 8,000 feet
Cessna's website says the 400's service ceiling is 25,000 feet but I don't think any 400 pilot would dare to go up that high. Perhaps a professional...