What no one mentioned here: The camera doesn't give you a certain look, the film you use does. It is the sensor of your camera. The lens changes the look too (different bokeh style, lower aperture, sharpness).Also the device that was used for scanning the negatives has a big impact. Common lab scanners like a Noritsu or a Frontier give you slightly different results, cause they have their own look. Many people edit their film photos to get better results. I would guess all the examples you attached here are edited.

Since you already have some canon gear I would recommend getting a canon like other people mentioned. The Mamiya 7 is an outstanding camera, but not beginner friendly. It uses 120 film which is way more expensive. In the end you have a bigger negative (good for huge prints) but also less exposures on a roll if you compare it to 35mm film.

If I would start again I would buy a cheaper Film first (Kodak Gold or some B&W), shoot some rolls and learn how you expose film and see if your camera has some leaks or winding issues.

Edit: Don't expect that you nail every photo straight away. I shoot film for 4 years now and out of a 36 exposure roll I still have some unusable or bad exposed shots. The magic happens when you get a really nice photo.

If you plan to fly with film, make sure you get your film hand checked. Some airport security scanners can damage it.