A system for use with a subterranean well having multiple earth formation zones, the system comprising: a production string comprising first lines carried thereon; and a completion string coupled to the production string, wherein the completion string comprises second lines carried thereon, wherein the first lines on the production string are coupled to the second lines on the completion string via a wet connection;wherein the first and second lines comprise an optical waveguide which senses at least one property of the fluid as it flows between the completion string and at least one of the zones; wherein the completion string further comprises: multiple well screens which filter fluid flowing between the completion string in the well and respective ones of the multiple zones; multiple flow control devices which variably restrict flow of the fluid through respective ones of the multiple well screens; multiple hydraulic control devices which control application of hydraulic actuation pressure to respective ones of the multiple flow control devices to control operation of the multiple flow control devices to variably restrict flow of the fluid through the multiple well screens, wherein the multiple hydraulic control devices are connected in the completion string, and wherein the multiple hydraulic control devices control operation of the multiple flow control devices using one or more signals transmitted to the multiple hydraulic control devices via the first and second lines; and multiple pressure sensors which sense pressure of the fluid which flows through respective ones of the multiple well screens. a production string comprising first lines carried thereon; and a completion string coupled to the production string, wherein the completion string comprises second lines carried thereon, wherein the first lines on the production string are coupled to the second lines on the completion string via a wet connection;wherein the first and second lines comprise an optical waveguide which senses at least one property of the fluid as it flows between the completion string and at least one of the zones; wherein the completion string further comprises: multiple well screens which filter fluid flowing between the completion string in the well and respective ones of the multiple zones; multiple flow control devices which variably restrict flow of the fluid through respective ones of the multiple well screens; multiple hydraulic control devices which control application of hydraulic actuation pressure to respective ones of the multiple flow control devices to control operation of the multiple flow control devices to variably restrict flow of the fluid through the multiple well screens, wherein the multiple hydraulic control devices are connected in the completion string, and wherein the multiple hydraulic control devices control operation of the multiple flow control devices using one or more signals transmitted to the multiple hydraulic control devices via the first and second lines; and multiple pressure sensors which sense pressure of the fluid which flows through respective ones of the multiple well screens. multiple well screens which filter fluid flowing between the completion string in the well and respective ones of the multiple zones; multiple flow control devices which variably restrict flow of the fluid through respective ones of the multiple well screens; multiple hydraulic control devices which control application of hydraulic actuation pressure to respective ones of the multiple flow control devices to control operation of the multiple flow control devices to variably restrict flow of the fluid through the multiple well screens, wherein the multiple hydraulic control devices are connected in the completion string, and wherein the multiple hydraulic control devices control operation of the multiple flow control devices using one or more signals transmitted to the multiple hydraulic control devices via the first and second lines; and multiple pressure sensors which sense pressure of the fluid which flows through respective ones of the multiple well screens.