Is it worth investing in a used 35 mm Film camera?

Having recently started to shoot some film myself, I'd say that

• yes, there will be a noticeable difference - you will have a full-frame camera, all your lenses will capture wider angle on the film (no crop factor). Captured area is 2.56 times bigger than with your crop sensor at same focal length, so your digital meter reading might be invalid for the larger frame. With negative film, it won't matter much, but if you spend so much on an EOS body, why not trust its light meter?

• digital has passed film in terms of sharpness

• with selected films, your images will be more colorful out of camera, but you can adjust color saturation on your digital images in post processing with more control over the result

• to get an 18MP image, you must scan your film at 3700ppi resolution; but since your 60D has a Bayer sensor, there's lots of interpolation going on to calculate pixels, so 2800ppi (giving 10MP) should suffice for a comparable image. Compare with numbers of your scanner to see if you'd gain or lose in resolution. Also, to get optimal color transmission and reduced film grain, be prepared to try out wet mounting.

With negative films, there will be some tweaking and guesswork to get colors right. A slide film might be easier to scan; Fujifilm Velvia is a classic film used for landscapes.

Yes, going to film photography is really interesting for many reasons:

• color rendering. I have had many digital cameras since decades now, and none of them have achieved the vivid color rendering of the photo below (so easy with film). Even with editing - just increasing saturation or applying filters etc. isn't enough, color rendering editing is a difficult art if you are a perfectionist.

  

  You probably recognize a photograph by the famous artist Martin Parr, who used cheap consumer-level films at this period (Agfa Ultra to be precise, no longer produced).

  He shoots in digital nowadays, but I still think his photos from decades ago had a better color rendering. Or maybe am I just nostalgic of the 70s photo look? (funny, because I wasn't born at this period)

  Of course, you can always edit color rendering in post-production, but here I'm speaking about getting the desired rendering without editing.

  It's so nice to get the roll of film developed, then just look at the photos, and have a great color rendering without doing any editing, out of the box, similar to the photo above.

• a different process/worfklow: using film has taught me to take fewer pictures (because film and development is expensive) and to think more before shooting. It is an interesting journey!