Funny, I've never wondered how much happier I'd be with an MX. I absolutely see the on-paper benefits as NCL4701 outlined above, but so far I have not once thought I'd be happier with a larger machine. Though, maybe the larger front tires would be nice to smooth out the ride across the pasture - I just figure I have more work to do to smooth things outIf you’re like me, you’d be very happy with the L, but if you go that route on occasion wonder how much happier you would be with an MX.
Edit: actually, the above isn't 100% true. I have sometimes wondered how I'd feel if I'd gotten a 4060LE instead. More loader capacity, larger frame, but less HP.