We also own a 2013 Mercedes GLK 350, the headlamp housing looks very similar to the 4Runner but of course the OEM bulb is a Phillips HID, probably in the 5K+ temp range. Optically speaking? At night both of these vehicles seem to extend their beam patterns the same distance, I see the same swath of light spectrum side to side on dark streets and the same cut off. The only thing different in my opinion is colour temp of course. And the Benz lights auto level.
I think I have good night vision, I drive my motorcycle at night with a dark tinted visor and have no issue, but practically speaking I think maybe because the halogen bulbs are still new and strong they seem the same as our GLK. My 2000 Jeep TJ with sealed beam halogen bulbs had to be replaced every 2-3 years just because the intensity came down and you could see they didn't shine nearly as far as before, but when new they were great.
I've pre-ordered these new SL1 LED's from Diode Dynamics as I'm very pleased with their other products and I simply want to have a different colour temp in the truck, similar to the Benz. I don't expect them to shine any farther or brighter of course - but the advertising says otherwise. I'll report back when they are eventually shipped / installed.