I bought an R with the RF 24-105 L about 3 years ago, and I added the 24-105 RF STM a year ago for ease of carrying. The RF L lens is clearly the best, as it should be, given the price. But there's very little in it between the STM and the EF L - optical performance is remarkably similar - weakest at 24mm, otherwise pretty decent. Canon EOS RP, Canon RF 24-105mm f/4L IS at 24mm, hand-held at 1/8 at f/4.5 at Auto ISO 800, Perfectly Clear. bigger. Ocre Walls, New Orleans, Louisiana, February, 2019. Canon EOS RP, Canon RF 24-105mm f/4L IS at 24mm, hand-held at 1/8 at f/4.5 at Auto ISO 1,250, Perfectly Clear. bigger or full-resolution. NEW: Canon LH E1 for mounting the RF 24-105/2.8 in a rig, also at Adorama. NEW: Canon PZ E2 Camera-Powered Power Zoom Adapter for RF 24-105mm f/2.8 , also at Adorama . NEW: Canon PZ E2B Camera-Powered Power Zoom Adapter with 20-pin remote port . 2WFdr.