I didn’t know that likelihood was different for different lobes. BUT definitely get a PET scan. And if it indicates malignancy, see an oncologist as well. That doc will be the one that helps with ongoing monitoring, advising whether there are reliable options other than surgery, etc.
In my experience, the idea of partial lobectomy is abandoned if it is malignant. But that is just my experience. My surgeon did a wedge resection of the area with the 1.5cm tumor, kept me sedated while the pathologist confirmed malignancy, and then took the left lower lobe out.

You need to trust that your surgeon has your Good outcome at heart. If you don’t, find another one.