While on a fixed focus 28mm f / 1.8 + 50mm f / 1.2 + 100mm f / 2.8 + 200mm f / 2.8 + 300mm f / 2.8 will be better but it will be more expensive and more heavy!
This is really my bedside goal. Weight management may itself be easily circumvented by the use of a Carry Speed type of strap