I've never seen a radio that's got ears yet,is this a new American thing like audio gain from an antenna.
If your asking which radio has best sensitivity its probably a pointless question as most if not all will drop below the noise floor at 27mhz. Therefore any extra sensitivity is worthless unless you plan using your radio connected to a sign generator instead of an antenna.
What you should be seeking is a radio with good selectivity,good image rejection and a front end that doesn't overload easily,coupled to a high quality antenna system (the real ears of a set up)
You could do a lot worse than a cobra 148 gtl dx/ss360fm/president grant if AM is your thing if 120 channels is sufficient, if you need more then for a slight drop in selectivity/slight gain in sensitivity a president jackson is about as good as it gets in 11m exports,a lincoln/2830/2510/2600 is a good bet if you must have a frequency readout,ss3900's are a good modern choice.
If you just need 40 channels I would search out an old cobra 148 gtl or president grant xl, off the shelf at sensible prices it don't get much better.