Ok, thanks for the new thread!
Looking at Rob Sherwoods receiver test data http://www.sherweng.com/table.html
which I trust more than ARRLs testing, I see the Icom 706MKIIG ranks #45 of all the receivers tested so far for narrow spaced dynamic range performance. Getting a good rating here takes cost money and reflects the design and engineering effort put into the receiver.
At #45 the 706MKIIG is rated better than some well known but older contest radios like the Yaesu FT-1000D or the newer Kenwood TS-480 series and not far down from the Icom 756 PRO III or the very expensive WJ HF-1000 receiver.
The Icom IC-7000 ranks #91 and below some older mid grade table top SW receivers like the Icom IC R-75 or Kenwood R-1000. This may explain why most of my friends who traded off their 706MKIIG for an IC-7000 and use them on a large home antenna can tell the 7000 has problems with strong nearby signals, not to mention the 7000 has known problems with low voltage like shutting down when the battery voltage gets a little low, etc.
The 707MKIIG is not without problems as it does draw excessive current on receive at almost 2A, which is not good for portable battery operation and the fan tends to cycle on and off when just receiving which is annoying. They have been out of production for some time now and like anything else will be more prone to failure as time marches on.
I have two 706MKIIGs and one original 706 and they have given me many years of trouble free use until recently when one of the MKIIGs had a low voltage regulator problem. This particular radio has bounced around in three 4WD vehicles for maybe 20yrs. I've used a 7000 in a mobile installation and it worked ok and being on a small mobile antenna I didn't notice any receiver overload problems but the complaints are coming from people who are using them on home antennas.
With all that said I am still curious what exactly happened with W5PKYs 706s to cause a 7000 to work better? That is quite opposite of my experience and of anyone I have talked to who has owned both radios.
I know this will stir up some 7000 owners to chime in but I would like to hear more from people who have owned or used both radios.