A photographer running two Canon mirrorless bodies, an EF-to-RF adapter, and a pair of fast EF telephoto primes sits in one of the most common upgrade traps in the adapted-lens world: the kit already works, the next lens is legendary, and nobody can quite explain what it would actually change. The specific case here is an EOS R8 and an EOS R100 paired with the EF 85mm f/1.8 USM and the EF 100mm f/2 USM, with the EF 135mm f/2L USM as the candidate purchase.