What is the difference between Audi A7 and Audi S7 and when should one consider purchasing the latter?

I am in the market for a luxury sedan and have come across both the Audi A7 and Audi S7 models. They seem quite similar in terms of design and features, but the S7 is significantly more expensive. Is the price difference justified and what are the key differences between these two models?

The major difference between the Audi A7 and Audi S7 is in their engine configurations. The A7 has a standard 3.0-liter turbocharged V6 engine, while the S7 has a more powerful 4.0-liter twin-turbocharged V8 engine. If you are looking for a more powerful and high-performance vehicle, the S7 would be the better option.