I've read the theory many times. A smaller sensor has bigger depth of field. That is why most of the tiny sensor compacts show everything from near to far in focus, including all of the camera phones. Four thirds have a bit less depth of field, APS-C further reduces it, and full frame takes in another notch further.
Even if you are looking at this photo at a rather reduced size you can probably see that the trees across the pond are not in focus. Looking on a large monitor, let alone at 100%, clearly reveals depth of field issues. To illustrate that here, I circled two areas that I am adding 100% crops for.
Foreground plants
Background trees
I have been shooting with an APC-C sized Nikon D200 (DX designation on Nikon cameras) for many years and learned that I would have gotten away with my settings here. The foreground plants were at about 6 feet. I selected F/11 and focused on the plants. I could have focused at the hyperfocal distance, or at least slightly past the plants, maybe on their back row. But I did not. Over the years I got used to the APS-C sized sensor providing enough depth of field in these situations.
After I realized my mistake I used DOFMaster (there's also an iOS DOFMaster App, or you can use the free alternative Simple DoF) to find out how far off I really was. So here's the scoop.
Full Frame (FX on Nikon):
Wow! Under 30 feet for the far distance! My guess would be that the background trees were about 150 feet far. Not even close to the 30! Looking at the additional information from Simple DoF reveals that just a slight adjustment could have easily resolved the situation, had I realized the need.
Focusing just a foot and a half past the plants would have provided depth of field to infinity and kept the plants in acceptable focus at the same time. Another alternative would have been stopping down to F/16.
Below is the data showing what I was used to on the smaller sensor of the D200.
APC-C (DX on Nikon):
As you can see, 6 feet were actually past the hyperfocal distance on APS-C and even a closer focus would still result in enough DOF to extend to infinity.
It's time so construct some new charts for myself and get used to more distant hyperfocal distances, stopping down more, or using wider lenses with greater DOF.
Have fun focusing!