Hm, okay, maybe not many lenses, but certainly quite some some.
Until recently Canon got no 50mm that was as good as the Sigma 50mm Art. The 1,2L was noteable less sharp and slower.
I think there was no wide angle with IS and f 2,8 like the Tamron 15-30 f2,8 VC which I used a lot for a lot of beautiful, handheld shots in low light.
Laowa got lots of unique lenses. The 24mm macro Probe is certainly VERY unique. Also they got the insane 15mm Macro (unique look) and some nice 2X Macros (Canons Macro was only 1X I think?). The Zero Distortion 12mm also got a lot of good feedback, a light and sharp Super Wide lense.
Tamron got the first 35mm IS lense I think. The Sigma and Tamron 150-600 was also very popular, I am not sure if Canon got a comparable lense?