In macro photography, the main objective is to achieve as much magnification as possible. Having the ability to go up to 4.5 times magnification is impressive, considering most macro lenses in the market only offer 1 time magnification. For normal practice, to achieve higher magnification from the normal macro lenses, alternatives such as macro adapters or extension tubes need to be adopted. Having a native high magnification of 4.5 times real size without the need for further macro modifiers can open up interesting photography opportunities, with only one important question yet to be answered: the quality of the optics. At this moment, there are no real world tests and independently tested image samples to draw meaningful conclusions on how the Zhongyi Mitakon 20mm f2 macro lens performs.
You can find out more about the Zhongyi Mitakon 20mm f2 Macro lens at their official product page here.