We have a 2014 L&K 4x4 estate, which we bought at just over a year old. It's great, but after a couple of punctures on the Conti SportContacts on the 18" wheels, and ahead of taking the car to the Alps in winter, I bought a set of Skoda 16" alloys with Michelin Cross Climates on them. They were fantastic in the snow - a combination of the 4x4 and the tyres meant that we didn't need chains even on fresh, deep snow. I couldn't believe how well it pulled up hill in the snow, and that's as a former LR Defender owner (I'm not pretending that the Skoda was better than the LR, just that it was much better than I was expecting).
I swapped them back for the 18" wheels in the summer 2016, but noticed the extra noise and the poorer ride, so didn't bother this year. Cross climates have done about 25000 miles and are still good for another 10-15000 on the front I'd guess.
The only disadvantage of the 16" wheels is that they look a bit odd on such a large car, but I don't really care!