Do Osteichthyes fishes have any cartilage?
Yes, Osteichthyes do have cartilage. For example, Ancient origin of lubricated joints in bony vertebrates shows images of cartilaginous tissue in the joints of several bony fish.  More generally, cartilage is required for normal bone development, and Osteichthyes are no exception (e.g. Distinct patterns of notochord mineralization in zebrafish coincide with the localization of Osteocalcin isoform 1 during early vertebral centra formation).