Condenser, not compressor. Compressor is just a single part within the condenser unit.
4G38VA2 performance with 1x FN13, 3x FN10 - bold indicates fulfilled FCU performance
1x FN10 - 9.5K
1x FN13 - 11.9K
1x FN10 + 1x FN10 - 9.5K + 9.5K
1x FN10 + 1x FN13 - 9.5K + 11.9K
2x FN10 + 1x FN13 - 7.3K + 7.3K + 9.1K
3x FN10 - 7.9K + 7.9K + 7.9K
All units on: 5.6K + 5.6K + 5.6K + 7.0K
GC price is $5390, so $5.3k is okay provided the installer is good. Remember that aircon spec & brand is one thing, installation quality is also key. If $4.0k but installation like sai, I also don't want because down the line will give more problems.