This four images show the results of different resolutions. The Isoclust Classification and the Minimum Distance to Means Classification were performed again on the Ikonos Image in 16x16m and 32x32m.
From a visual inspection, a generalization can be observed, which is evident in the areal coverage of each class (see charts in the Analysis section).

Isoclust Classifier in Resolution 16x16m

Isoclust Classifier in Resolution 16x16m

Minimum Distance to Means Classifier in Resolution 16x16m

Minimum Distance to Means Classifier in Resolution 16x16m