Soft robotics represents a rapidly evolving field, and dielectric elastomer actuators (DEAs) have emerged as an exceptionally promising technology within the realm of actuator concepts. These DEAs bring forth notable advantages, including substantial deformation, rapid response times, and the ability to sense their own strain and stress states. An innovative strategy involves integrating anisotropic layers, such as fibers, to enhance actuator performance. Fiber-reinforced DEAs have garnered attention for their capacity to augment force output and eliminate the necessity for additional structural support. Carbon fibers, in particular, stand out due to their elevated stiffness and electrical conductivity, serving not only as effective reinforcement but also as materials for the actuators' electrodes. Moreover, DEAs demonstrate the capability to leverage their electrodes for self-sensing, utilizing them, along with the dielectric, as resistive or capacitive sensors. Despite the various methodologies proposed for implementing sensing and control functionalities, there remains a gap in understanding the piezoresistivity of carbon fiber-reinforced DEAs. In this work, we investigate the piezoresistivite properties of carbon fiber-reinforced and carbon particle-based electrodes to compare the difference between conventional and the emerging reinforced electrodes. A key result is the unexpected inverse piezoresistive coupling of carbon fiber-reinforced electrodes after an initial loading cycle. This antiproportional strain-resistance behavior persists over the remaining cycles. In addition, the lower resistivity of carbon fibers dominates the compound resistance behavior of the electrodes over the pure particle-filled elastomer.