OK, I have to ask... why are you mowing the field ? I have farmers that pay for 6-10 acre fields near me so instead of YOU cutting grass, you could be paid and watch crops being grown and harvested.
I have a 2001 Husqvarna ZTH-6125 zero turn mower that I bought new. It is now 25 years old. My only wish is that I had bought it 10 years earlier.
The deck is adjustable from 3 to 6 inches (IIRC) and with sharp blades and the deck height set to 3 inches it will cut 12 inch high DRY grass with ease, even with its 61 inch cut. It will cut wet grass well, but not as smoothly as dry grass.
The beginning of the second season I had to replace all the hydraulic lines, as they leaked at the ferrules. Poor design on the part of Husqvarna. One coil went bad just last year, I replaced both with new Kawasaki units. Other than that, just maintenance items. The engine burns no oil.
For all but the last 3 years I cut 10 acres of grass weekly. The mower cut my time in the seat in half compared to a tractor and bush hog. Push mowing/weed eating is near zero because you can cut that close.
One bad point with zero turn mowers is when they are used on hills of any significant angle. They are fine until you have to change direction, even a little bit, and then they go like a dart, straight downhill and out of control. When I bought my zero turn I lived in NJ, where everything is flat or nearly so. Now I live in WV, where you have two choices of direction, up or down.When we bought our house on 5 acres of old cow pasture, I originally ran the B2650 with a 72" finish mower and an old, sketchy ridder. The next season i was on the hunt for a zero turn. Bought a used Scag Turf Tiger 61" cut and man....that thing does such a nice job and is sooooo much faster and nimble, I don't know why everyone doesn't use one. I can cut our 5 acres in 2 hours or less most days, unless it's early spring when the grass is thick and wet.