Thanks all for your comments. And Pirate, that video was illuminating. My flight is from Seattle so quite a bit longer.... thinking I'll splurge for the extra $500 with Lufthansa, this is BTD after all!
We booked flights for August to KEF and then on to AMS. We are taking a cruise from AMS RT. The cruise line would not do the layover in KEF so we had to book RT SEA to KEF with the cruise to get "first" class at their "30% sale price". Since we booked last Oct, the fare was pretty good (that's Norwegian for F'd up), 3 of us $2100 pp plus I had to book RT KEF to AMS to catch the cruise and paid about $600 pp for Saga Premium.
Seatguru.com is my source for checking specific flights/dates to see what seats are being offered and which ones are no bueno.
Since the flight from SEA to KEF is not more than 8 hours direct, I figured it was worth the domestic type seat to do the layover in KEF a few days. The flight KEF to AMS is about 2 hours+. Normally we only fly real Business class to Europe.
I am pretty certain the coach seats are worse than Alaska coach seats, so I would definitely choose Saga Premium. So, for us with the layover we paid about $2800 pp total. The bonus was we get miles credit on Alaska by flying Iceland Air.
Had we chosen to fly on Delta KLM or United RT AMS, our Business class would have been over $3500 pp at that time. Recently I was seeing this had gone way up towards the $5000 pp rate.
I might recommend if you are flying to Germany, check out Condor. We flew Condor Business RT FRA SEA in Business and it was just great with direct flights and cheaper than others. We even used Alaska miles for a good price. BA is much easier to book, but they get you on taxes flying through LHR.