I second LAWALLSTRACTOR, and CHARLIE175.
My 2015 handles a 5' box blade pretty well. With the scarifiers all the way down, in heavy soil with rocks, It will stop the tractor though. Not a power issue, but a weight/traction issue. That's with R-4 tires. Ags would be better for that kind of work.
As far as a finish mower... 5 foot, no problem at all.
As far as the brush hog... I've used a 4 and 5 foot hog. Although the tractor has the power to run the 5 footer well, the weight of the hog can be an issue. If you use a 5 foot hog, leave the loader on, and pick up a scoop of dirt to help keep your steer tires on the ground