Every description of pinhole photography includes some kind of statement like it’s not very sharp. I suppose that depends on what you photograph.
The diverse ecosystem in our front yard has done very well in the heat, punctuated by the occasional gulley washer. I sharpened the Classic 20” to deal with it.
So, sharp enough?
All with the The Evil Cube, .30mm pinhole 6cm from a 6x6cm frame. The film is Ilford Delta 100 semi-stand developed in Rodinal 1:100.