The best replacement for optima is sonata.

The best alternatives to optima are rated as following:
★★★★★  sonata
★★  accord
★★  camry
★★  altima
★★  fusion
★★  hyundai sonata
★★  odyssey
★★  diehard
★  passat
★  kinetik
★  forte
★  honda accord
★  ford fusion
★  anthem
★  duralast
★  cadenza
★  mazda 6
★  elantra
★  kinetic
★  die hard platinum
★  spectra
★  odyssey battery
★  interstate
★  odyssey batteries
★  interstate battery
★  kinetik battery
  altima 2014
  toyota camry
  sonata 2011
  duralast platinum
  nissan altima
  optima hp
  maxima
  sonata 2012
  2011 honda accord
  stinger
  sorento
  die hard
  exide
  orbital
  duralast gold
  hyundai elantra
  kia spectra
  xs power
  2010 mazda 6
  kodiak
  2013 nissan altima

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Speaking about optima, one probably shouldn't forget about hyundai sonata.

Other search terms related to optima and their ratings are:
★★★★★ hyundai sonata
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Google Trends

Scale is based on the average worldwide traffic of optima in all years. Click on graph for more.
optima
sonata
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