2025 520, A6 or E180? Anyone driving one? Looking for advice and experience

Hi, I'm torn between these three models: BMW 520 (2025), Audi A6 (2025), Mercedes E180 (2025). Has anyone actively driven any of these cars, or had the chance to experience one in detail? I'd really appreciate it if you could share info on the following: • Overall driving experience (comfort, handling, performance) • City and long-distance fuel consumption • Equipment - technology differences • Chronic issues or annoying points • Service - maintenance costs • Which model should be preferred and why? Real user comments will help me a lot in making a decision. I'd appreciate it if you'd share your experiences!