I was looking for the same thing, here a collection of what I have found.
Last year the OEAMTC (Austrian Automobil Touring Club, similar to the German ADAC) has tested several wintertires for the 4x4 SUV in the size 235/70 R 16, similar to the Sorento's 245/70 R16.
Here is a link:
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Hope that the German text is not a big problem. Trocken = Dry; Nass = Wet; Schnee = Snow; Eis = Ice; Komfort = Comfort; Aussengeraeusch = Autside Noise; Rollwiderstand = Rolling Resistance; smaller numbers are better.
The winners are: Continental 4x4 Winter Contact (T); Michelin 4x4 Alpin (S); Pirelli Scorpion Ice+Snow (T). All these come in the size of 245/70 R 16.
Unfortunately they didn't test the Bridgestone Winter Dueler DM-Z2, which is also available in P245/70R16 and wins a test by Tire Rack. It's grip on ice seems to be unreached and the only drawback is treadwear on dry road. Here the link:
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This year there is a new Bridgestone Winter Dueler DM-Z3, don't know about any tests or reviews of it and if it will be available in 245/70 R16.
Over here in Austria good winter tires are a must, especially for a vehicle weighing over 2 tons! ;-)
Cheers Josef