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I have to be brief since my wife is waiting.
The SD uses the 3135 movement, the GMT is a 35 Jewel movement. Patek is a superior movement.
I am not a watchmaker (nor even close) and I can only tell you what I read in journals and books. Kif is superior (why exactly, I don't know), Breguet is not always superior, but more adustable and more expensive to make. Omega Calibre movements are modified ETA, but the amount of modification is minimal in contrast with IWC et al. Breitling, like Omega has their own Calibre movements which are based on ETA, and are essentially considered ETA.
ETA is not garbage, but not ETA movement has the technology found in a Rolex or Lemenia for that matter.