From Consumer Reports:
Speaking strictly in terms of performance, the answer is no. Just within the built-in category, Thermador and Jenn-Air are two competitors that cost slightly less than Sub-Zero and earned higher overall scores in Consumer Reports’ latest refrigerator Ratings, largely on the strength of their quieter operation. The Sub-Zero B1-36U, $7,700, is particularly noisy, which could be an issue if you’re sound-sensitive.
Looking across all types of refrigerators, the highest overall scores belong to several French-door bottom-freezers that cost between $1,500 and $2,700. That top performance has helped make French-door fridges the fastest-growing configuration. But then, part of the reason people spend $7,500 on anything, including a refrigerator, is so that they can own something that most people don’t have and for their design, just like Apple.
There’s no clear answer on whether they’re worth the money or not. It provides all of the same features as a lesser priced substitute brand, but if you can afford the Sub-Zero Refrigerator then by all means you should purchase it. If it’s outside of your budget, don’t make the decision lightly.