Depends on your settings and what type of MPEG.
Also, FCP has had ProRes (including 422) for a long time. Are you sure you can't update your Pro Video Formats to get it?
According to Wiki Prores 422 was introduced in 2007 with Final Cut Studio 2. I ain't shelling out $600 if I don't have to.
Depends on the settings? Well here's my other 2 choices....
MPEG-2
Supported containers: MPG, MPEG, M2P, M2T, M2TS, TS
Profile: Main
Recommended bitrate for HD Resolution: 80 Mbps
Recommended bitrate for SD Resolution: 50 Mbps
Key frame interval: 1-second or less. I-Frame only preferred.
Audio format: PCM or MPEG Layer II
Recommended bitrate for PCM Audio:◦ 5.1 – Lossless, Sample Rate: 48 kHz
Stereo – Lossless, Sample Rate: 48 kHz
Recommended bitrate for MPEG Layer II Audio:◦ 5.1 – Data Rate: 768 Kbps, Sample Rate: 48 kHz
Stereo – Bitrate: 384 Kbps, Sample Rate: 48 kHz
H.264
Supported Containers: MP4, M2T, TS Note: H.264 video in MOV wrappers isn’t supported.
Profile: High
Recommended bitrate for HD resolution: 30 Mbps
Recommended Bitrate for SD Resolution: 15 Mbps
Key frame interval: 2 seconds (or less)
Audio Format: AC-3 or AAC
Recommended bitrate for AC-3 Audio:◦ 5.1 – Bitrate: 448 Kbps, Sample Rate: 48 kHz
Stereo – Bitrate: 192 Kbps, Sample Rate: 48 kHz
Recommended Bitrate for AAC Audio:◦ 5.1 – Bitrate: 768 Kbps, Sample rate: 48 kHz
Stereo – Bitrate: 320 Kbps, Sample rate: 48 kHz