I own both a Fender MIA P4 and an MIA P5. I very much enjoy the P5 when using standard tuning and we're covering a song that was recorded using 1/2 step down tuning. For example, Lie To Me by Johnny Lang, is recorded using 1/2 step down tuning. When playing this song using standard tuning you're in the key of A# instead of B. When playing in the key of B using standard tuning you have a fat sounding 4th using the open E string. Unless you consider a D# on the 6th fret of the A string a fat sounding 4th then playing the song in A# using standard tuning you don't have that fat sounding 4th with a 4-string. When using my P5, using standard tuning, in the key of A# I can access a fat sounding 4th using the D# on the 4th fret of the B string. Also, using my P5, I enjoy the deep notes I get while transitioning into another chord. Yes, playing my open B string does sound a bit awkward especially with out using palm muting and/or effective left hand fingering tecnique. However, when I apply what I consider effective B string technique my P5 sound very great.