Hi Tim,
this should to the trick.

.... as you get in MOUNT_POINT the mount point value (if mounted)
or you get the upper-level filesystem (no matters what it is).

Also, you cannot use your variable MONT_POINT if the computed
value is not the one expected...

Retagds,
Stephane

#!/bin/ksh
#
# test fs mount status
#
MOUNT_POINT=$(df /comx/data 2>/dev/null | awk ' (NR==2) {print $NF}')
if [[ $MOUNT_POINT != /comx/data ]] then
echo "fs is not mounted: /comx/data"
else
echo "fs is mounted: $MOUNT_POINT"
fi