Absolutely.
With a sensor of 6000x4000 that would give you about 62ppi which would look pin sharp to anyone from around 3-6 feet away. The eye can't resolve better than about 50ppi at 6 feet (20/20 vision).
My suggestion would be to get an A4 sample done at 62ppi so you could see how the resolution would look at up close distances. But bear in mind a print that big isn't intended to be nose-up-close looked at (unless you think it is of course).
If you need some ridiculous resolution, then you just need to take multiple images and stitch them or shoot large format film and get a drum scan done. You need 29,000px on the longest side to get 300ppi at 8 feet. (for comparison, the GFX 100 has 11.6k on the longest side)