I currently have a Canon 60D camera, but I always feel that taking pictures is not enough for me. Do I need to switch to a 6D?

I have the same feeling as you. I used the same grade of machine as the 60d to shoot, but after a long time, I found that the color and image quality are really not comparable to the full-frame ones. The effects of full-frame and half-frame are better. There is still a step-like difference between the 6d and the 60d. The color and blur are obviously a level higher than the 6d. The 6d's kit lens 24-105 is also much better than the 18-135. After all, it has a fixed aperture of f4 and the lens The resolution is also better than 18-135. The fixed aperture is very convenient in composition. The aperture value of full frame and half frame is obviously better than that of full frame.

If you want to switch to 6d, then Including the lens, you can only buy it again because the 18-135 is an efs half-frame lens and cannot be used on a full-frame body. No matter what lens is installed on the half-frame body, the focal length of the lens must be multiplied by 1.6 to convert it to the equivalent focal length of the 135 full-frame full-frame mount. Of course, the lens is the actual focal length and does not need to be converted