1. An implantable cardiac stimulation (ICS) system including a lead having multiple electrodes implantable proximate to a patient's left ventricular (LV) chamber, the system comprising: a pacing pulse delivery (PPD) module configured to simultaneously deliver multiple pacing pulses over corresponding left ventricular pacing vectors, the pacing vectors defined by electrodes proximate to the LV chamber; an evoked response recording (ERR) module configured to record evoked responses that are responsive to the pacing pulses, the evoked responses associated with the corresponding pacing pulses and measured over separate corresponding sensing channels; an evoked response comparison (ERC) module configured to compare the evoked responses to at least one template, the at least one template representing local capture of a local LV tissue region along one or more of the corresponding pacing vectors, the comparison used to determine whether the pacing pulses achieved local capture along the corresponding pacing vectors; and a pacing pulse update (PPU) module configured to update at least one of the pacing pulses or the pacing vectors based on the comparison of the evoked responses to the at least one template in order to determine a local capture threshold for the corresponding pacing vectors.