Google have just released standalone Spreadsheet and Document apps simply called Docs & Sheets.
https://play.google.com/store/apps/details?id=com.google.android.apps.docs.editors.docs
https://play.google.com/store/apps/details?id=com.google.android.apps.docs.editors.sheets
They link in with Drive (no surprises there) and seem pretty basic, but do seem a bit more functional than Quick Office.
Apparently, a presentation app called slides is en route too.
https://play.google.com/store/apps/details?id=com.google.android.apps.docs.editors.docs
https://play.google.com/store/apps/details?id=com.google.android.apps.docs.editors.sheets
They link in with Drive (no surprises there) and seem pretty basic, but do seem a bit more functional than Quick Office.
Apparently, a presentation app called slides is en route too.