If you are shooting art for yourself you really only need one lens. Not an all purpose lens but a lens you can believe in. A lens that, when you look through it, makes everything look more exciting and more real. A lens that matches the vision in your heart. - Kirk Tuck.
And how I agree. For years I just used one focal length - the normal lens. For 35mm format it was a 50mm. It all started with the amazing Carl Zeiss 50mm /1.7 T* for my contax 139 camera. For medium and large format the normal lens was the only lens I used. From the amazing Carl Zeiss 80mm T* for Hasselblad to 150mm for my large format. And it still continues. Today my favorite lens for landscape work is Carl Zeiss Loxia 50mm.
However most of my free time is spent with my family and when possible doing street, travel or environmental portraits of my family. Essentially to bring back memories from the trip. Give a sense of where we have been. And for that purpose nothing beats a good 35mm lens in my opinion.