What looks different in the glass is that the smaller panes are clearly visibly in the newer rendering. In the older rendering they are only hinted at which was probably completely unrealistic. The false impression of huge single panes gave it an architectural quality it couldn't achieve in reality.
However, with or withour panes the main problem with the newer design is not the dome but the fact the there now appear to be floors directly abutting the outside walls. The egg floating in the cube gave a completely different setting but was probably quite expensive to engineer.